BRD51 Posted November 6, 2013 Report Share Posted November 6, 2013 I installed a CMMG lower parts kit without fire control group in my DPMS lower. I took it to the range and found that the bolt catch would not release by pressing on it to allow the bolt to go forward. I had to pull back on the charging handle to release the bolt to chamber a round. Upon inspection, the bolt catch wobbles side to side, almost like the bolt catch screw is undersized. Either that or the hole in the bolt catch is oversized! The bolt catch will not move when the bolt is locked to the rear unless back pressure is applied to the charging handle. I have not yet removed the bolt catch screw to inspect the screw and/or hole size. Any thoughts on this before I do that? I have blue lock title on the screw which is why I am hesitant to remove the screw. Quote Link to comment Share on other sites More sharing options...
Robocop1051 Posted November 6, 2013 Report Share Posted November 6, 2013 (edited) Option A: Upgrade to the Phase5 bolt catch. I use this one on a SI-D .308 Option B: Upgrade to an Armalite bolt catch. It's a little less expensive than Op. A but still A+ quality. Both options include getting rid of the CMMG part. Don't even bother trying to salvage the part. CMMG parts aren't usually worth the effort you need to put into them. I'm not trying to be a dick, but 2/3 of the problems I read about here start with, "I installed a CMMG 《insert part here》and now my rifle doesn't work." Edited November 6, 2013 by Robocop1051 Quote Link to comment Share on other sites More sharing options...
BRD51 Posted November 6, 2013 Author Report Share Posted November 6, 2013 Thanks. That is good to know. So the Armalite bolt catch is fully compatible with the DPMS lower without gun smithing? Quote Link to comment Share on other sites More sharing options...
imschur Posted November 6, 2013 Report Share Posted November 6, 2013 yes Quote Link to comment Share on other sites More sharing options...
Robocop1051 Posted November 6, 2013 Report Share Posted November 6, 2013 To the best of my knowledge, the entire Armalite LPK is fully compatible with all builds. (Especially the AR-10A kit. That particular kit has the modified magazine catch, designed for ALL magazines.) The only parts that are proprietary are the bolt, barrel extention and barrel nut. Quote Link to comment Share on other sites More sharing options...
BRD51 Posted November 6, 2013 Author Report Share Posted November 6, 2013 Thanks for the advice! Quote Link to comment Share on other sites More sharing options...
98Z5V Posted November 7, 2013 Report Share Posted November 7, 2013 Did you use a screw to secure the bolt catch, or a roll pin? I know you said "bolt catch screw" above, but I just wanted to verify that it definitely was not a roll pin. <thumbsup> Quote Link to comment Share on other sites More sharing options...
BRD51 Posted November 7, 2013 Author Report Share Posted November 7, 2013 Yes sir, a screw. Quote Link to comment Share on other sites More sharing options...
survivalshop Posted November 8, 2013 Report Share Posted November 8, 2013 (edited) I have had two DPMS bolt catch screws crack on me, the bolt catches were also loose. I'm not sure using loc tite on that screw is a good idea. Hard place to work with , if it won't break free . If you are concerned about it backing out , just use a little on the end of the screw after you have installed it . That way if need be , it can be removed where you can see it . Heat always helps if you have problems with it . Edited November 8, 2013 by survivalshop Quote Link to comment Share on other sites More sharing options...
98Z5V Posted November 8, 2013 Report Share Posted November 8, 2013 SI Defense, for the new screws, even if the one you have is okay. If you order online, the calculated shipping is crazy. If you call them on the phone for it, ask them to ship it in the regular mail. Quote Link to comment Share on other sites More sharing options...
survivalshop Posted November 9, 2013 Report Share Posted November 9, 2013 SI Defense, for the new screws, even if the one you have is okay. If you order online, the calculated shipping is crazy. If you call them on the phone for it, ask them to ship it in the regular mail. Yep, its what I replaced them with . Quote Link to comment Share on other sites More sharing options...
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