cyclesteel
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« on: November 30, 2009, 21:37:38 » |
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I just picked up a used XCR-L and have few questions. I did search through the site but could not find what I was looking for. My main question is I noticed some wear/damage on the lower receiver ( see attached pic) . It looks as though the gun was dry fired while the upper and lower where apart. I did notice the same marks on some pictures on other XCR’s here on the forum. Is this anything I should be worried about?   I took the XCR apart last night barrel and all and I guess I did not tighten everything to spec. I went to the range today and after about 120 rounds I noticed the barrel was loose and the nut in the gas valve ( old gas valve) was loose and about to come off Could I have done any damage by this? I torqued the barrel screw to 200 inch pounds as per the manual when I got home so hopefully that took care of that problem but how tight should the nut be on the gas valve? All in all the XCR ran great the previous owner said there was around 2000 rounds through it. So it should have been nice and broken in Thanks Matt |
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MickeyC
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« Reply #1 on: November 30, 2009, 21:55:42 » |
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No issues.
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It takes only a few minutes of research on the internet to sound like a combat soldier and a few dollars to look like one, but it takes a little blood and a lot of guts to be one.
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Cid1911
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« Reply #2 on: November 30, 2009, 22:18:47 » |
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FYI, even though the manual says 200, they (Terra) are recommending you torque it to 250 inch pounds.
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Semper Fidelis
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cyclesteel
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« Reply #3 on: November 30, 2009, 22:44:06 » |
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FYI, even though the manual says 200, they (Terra) are recommending you torque it to 250 inch pounds.
200 seemed a lot I was worried about doing damage. I think my torque wrench only goes up to 250 inch pounds. What happens when that screw is over torqued ? Do the threads just get stripped? Does the upper shatter into a thousand pieces. I get a little ocd when instructions say not to over tighten. I usually tighten and loosen it a few times just to make sure, I also have a tendency of stripping out threads which according to my wife happens every time I try to fix something around the house. |
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Cid1911
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« Reply #4 on: November 30, 2009, 22:52:28 » |
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Mine is torqued to 250 and it has yet to shatter. I ordered a couple spare barrel bolts in case the original goes bad, but it's just a precautionary measure.
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Semper Fidelis
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LurpyGeek
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« Reply #5 on: November 30, 2009, 23:30:52 » |
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...It looks as though the gun was dry fired while the upper and lower where apart.
I did notice the same marks on some pictures on other XCR’s here on the forum.
Is this anything I should be worried about? You are correct in your assumption. That happens when the hammer travels forward without anything to stop it. It's not something I would recommend anyone try, but it shouldn't affect function. Congratulations on your purchase. |
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cyclesteel
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« Reply #6 on: December 01, 2009, 12:48:45 » |
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Just got back from the range and put another 150 rounds through it. The only problem I encountered was the nut on the gas valve kept coming loose even though I had it pretty tight, I just called Robinson inquiring about purchasing the new style gas valve. Hopefully they will call me back today.
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DSM
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« Reply #7 on: December 01, 2009, 12:53:31 » |
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I got my XCR right after they announced the new gas system in that first batch so I don't have any knowledge of the older system. That said, I can't think of an easier gas system to use than the current version. No worries. It'll be a worthwhile upgrade!
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For fiscal year 1996 NASA was authorized approx. $14.2B in spending. For comparison, the Health and Human Services budget for the same year was over $600B. In other words, Health and Human Services consumes the entire NASA budget in about 6 workdays. People who believe the money spent flying into space could be used to solve all our social ills should consider this fact: Does anybody really believe an extra 6 days of work by the social welfare agencies would solve our problems? -Mike Mullane
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cyclesteel
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« Reply #8 on: December 01, 2009, 13:26:41 » |
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Does anybody know if it is ok to locktite (blue) the Nut on the old style gas valve ?
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aziator
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« Reply #9 on: December 02, 2009, 08:43:50 » |
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You shouldn't have to locktite it, you just may have to tighten it down real good. I remember the first time I broke mine loose to adjust the gas I couldn't believe how hard it was torqued down. You would be best to upgrade to the new system but the old system works fine too.
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"Play to win, or don't bother. Check friendship at the door. A "friendly game' is a contradiction of terms. When looking for entertainment, there is the theater. When camaraderie is your need, there is the bar."
-Doc Holiday
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Desert_StormTrooper
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WarriorCode - vi et animo
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« Reply #10 on: December 02, 2009, 08:55:18 » |
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I just got mine this week too, also "pre-owned". I had the same wear from some open dry firing, but not excessive so not too concerned over it.
Just getting familiar with it this week, hope to get it out to the field soon. Pretty naked, need to put some functional clothing on and dress it up a little.
Tough decision between this and the new LMT but I'm becoming a big fan of my RA/XCR-556 Light. Still might go pick up the LMT just so I can have something in a standard AR platform too.
Is that the old 2 piece BHO in your picture? My SN is in the mid 300's but I don't think mine looks like that...I'll have to go check it again.
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My permit to carry? It's the 2nd Amendment, the Bill of Rights, the US Constitution. Want to see it? It says "Shall not be infringed".
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cyclesteel
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« Reply #11 on: December 02, 2009, 10:24:56 » |
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It is the old style 2 piece bolt hold open. The camera flash is reflecting off of it which is distorting the image. My serial number is in the 1100 range. I also noticed some ware spots on the ejection port. I know the previous owner put a lot of steel cased ammo through the XCR so that is probably what caused that.  |
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Mastiff
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« Reply #12 on: December 02, 2009, 12:22:37 » |
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Are you sure it's wear and not build-up?
I shoot a lot of Zinc-plated Silver Bear Ammo in my 7.62x39 XCR and the edge of the ejection port has a small build-up of Zinc on it, no actual wear.
Either way that won't effect function and is mainly just a cosmetic issue, plus the receiver is Aluminum so no worries about rusting.
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Terra says:
You MUST run good, high pressure ammo through your XCR for the first 300 rounds AT LEAST if you expect a smooth break in.
Translation:
Don't use Wolf for break in, if you do, don't complain, or she'll find you and paint your rifle PINK!
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cyclesteel
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« Reply #13 on: December 02, 2009, 13:12:53 » |
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Thanks everybody for all the info. Hopefully I am not being a PITA. I have been reading through the forums the past several days but I do have few more questions. I have been emailing Terra also and she has been very helpful. When I was cleaning the XCR last night and noticed some brass shavings in the Lower near the buffer /stock area. Is this normal? I have been shooting federal xm193 Does any body have a picture of their firing pin hole. I am not sure if mine has been chamfered or not. It looks sort of like it does but I have nothing to compare it to. I checked some of the spent brass and from what I could gather none of the primers showed signs of craters. I will check again tomorrow when I go to the range. If it has not been chamfered. Should I not worry about it since I do not seem to be exhibiting any of the problems that are associated with it.    |
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LurpyGeek
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« Reply #14 on: December 02, 2009, 14:13:08 » |
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It's not uncommon for me to see a few brass flakes in the action when I clean mine. Nothing too heavy and nothing that has ever affected function.
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Mr. Riggs
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« Reply #15 on: December 02, 2009, 17:17:15 » |
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« Last Edit: December 02, 2009, 17:33:53 by Mr. Riggs »
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A fool takes no pleasure in understanding, but only in expressing his opinion. - Proverbs 18:2
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cyclesteel
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« Reply #16 on: December 02, 2009, 19:51:03 » |
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Thanks for the pictures Mr. Riggs it looks as though mine is not really chamfered . On more question . Does any body know what are the circle marks on my bolt face. I noticed Mr Riggs dose not have them on his bolt face and my AR and AK do not have any circle marks. Is it pitting? Thanks  |
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Mr. Riggs
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« Reply #17 on: December 02, 2009, 20:02:40 » |
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Crude machine tool marks.
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A fool takes no pleasure in understanding, but only in expressing his opinion. - Proverbs 18:2
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MickeyC
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« Reply #18 on: December 02, 2009, 21:30:48 » |
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The XCR has a few manufacturing quality issues from time to time. Not too big a deal though.
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It takes only a few minutes of research on the internet to sound like a combat soldier and a few dollars to look like one, but it takes a little blood and a lot of guts to be one.
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DSM
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« Reply #19 on: December 02, 2009, 22:01:35 » |
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Riggs- That 7.62x39 you're shooting is either really hot or has really, really hard primers 'cause your firing pin is taking on a flat shape!
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For fiscal year 1996 NASA was authorized approx. $14.2B in spending. For comparison, the Health and Human Services budget for the same year was over $600B. In other words, Health and Human Services consumes the entire NASA budget in about 6 workdays. People who believe the money spent flying into space could be used to solve all our social ills should consider this fact: Does anybody really believe an extra 6 days of work by the social welfare agencies would solve our problems? -Mike Mullane
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Mr. Riggs
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« Reply #20 on: December 02, 2009, 22:31:38 » |
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Riggs- That 7.62x39 you're shooting is either really hot or has really, really hard primers 'cause your firing pin is taking on a flat shape!
I'll put in an order for a new one. Thanks for pointing that out. |
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A fool takes no pleasure in understanding, but only in expressing his opinion. - Proverbs 18:2
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wildphil24
Newbie
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« Reply #21 on: March 03, 2010, 12:26:01 » |
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FYI, even though the manual says 200, they (Terra) are recommending you torque it to 250 inch pounds.
200 seemed a lot I was worried about doing damage. I think my torque wrench only goes up to 250 inch pounds. What happens when that screw is over torqued ? Do the threads just get stripped? Does the upper shatter into a thousand pieces. I get a little ocd when instructions say not to over tighten. I usually tighten and loosen it a few times just to make sure, I also have a tendency of stripping out threads which according to my wife happens every time I try to fix something around the house. I figured it out last night! I was reassembling my 6.8spc barrel for the first time. Instead of using my feeling, I went with my new Mastercraft torque wrench on 180in/lbs. The wrench didn't click so I cranked it until the screw broke off!  So the screw is tightened to maybe 300-400in/lbs with no head. Kind of shitty! At least I can hope the threading isn't stripped and the barrel extension isn't damaged. Any advice on this? Time to order a new screw and figure how to remove the broken one! |
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XCRmonger
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« Reply #22 on: March 03, 2010, 13:22:35 » |
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holy hannah... that's quite an accomplishment.  If you had the torque head on wrong, IE backwards, it wouldn't have clicked. You will likely have to have it drilled out at a machine shop. |
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I am no longer an RA staff member. Just a fellow XCR owner.
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Jack-O
much funnier in person
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« Reply #23 on: March 03, 2010, 17:32:29 » |
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Riggs- That 7.62x39 you're shooting is either really hot or has really, really hard primers 'cause your firing pin is taking on a flat shape!
I'll put in an order for a new one. Thanks for pointing that out. It just looks like it's dirty to me  |
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trainers dictate gear, gear dictates technique, technique dictates coolness, coolness dictates effectiveness.
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wildphil24
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« Reply #24 on: March 03, 2010, 19:27:05 » |
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Thanks Terra, that's what I was thinking about. I'll talk about it to my neighbor who's a retired mechanic. Is the screw model chosen to break before the receiver or barrel extension? Should I be worried about these issue? Finally, can you ship a replacement to Canada or should I go with Wolverine supplies? Phil, not so proud  |
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