gunjunky Posted January 13, 2011 Report Posted January 13, 2011 I have a standard ar 15 Magazine Catch in my 308 CMMG lower and the mag falls out after each round fired and I have Failer to feed issues. DPMS tolled me they only sell one type but the smith at AMMO bros told me I need to change it to a 308 type and I can't find one DPMS dozn't sell one nor doze brownell. I have tried two DPMS 10 round mags same issue.Help
imschur Posted January 13, 2011 Report Posted January 13, 2011 The AR-15 and 308 use the same magazine catch. Are you sure the mags are seating? Which CMMG lower and what mags are you using?How about some pictures of both sides of the receiver (focus on the mag catch parts) as well as a shot of the interior of the magwell.
gunjunky Posted January 13, 2011 Author Report Posted January 13, 2011 I am not sure which CMMG receiver it is. It takes LR 308 mags. and has a DPMS lower kit with a Bill Sprinfield trigger. The upper reciever and barrel is Fulton the Bolt carrier group is DPMS. I am in California so it has a bullet button.I will post the pick as soon as I can. I am sure the mags are seated. I zeroed the gun yesterday it shoots great other than the mag drops and the failer to feed. Some times the BCG just slides right over the top of the round.
TacBlade Posted January 13, 2011 Report Posted January 13, 2011 I would say there is a problem with the spring that you are useing? Not really sure though? If you have another AR15 or can take a look at another AR and compare the springs or just compare everything to do with the release?
gunjunky Posted January 13, 2011 Author Report Posted January 13, 2011 I have more springs. I will change it tonight. I get them with the lower kits and the bullet buttons. Thanks
imschur Posted January 13, 2011 Report Posted January 13, 2011 What brand magazines are you using?If you dont have any Magpul PMAG LR20's I cant recommend them enough to troubleshoot and solve feeding issues.
gunjunky Posted January 13, 2011 Author Report Posted January 13, 2011 No, I am using DPMS factor mag's the quality is not great. They are only a few months old. I will pick up a Pmag this week. Hopefuly that and changing the spring will do it.Thanks
survivalshop Posted January 13, 2011 Report Posted January 13, 2011 If the bullet button makes the mag integral to the lower . I would look there as far as the mag releasing .Which could be part of or the problem with the FTF also.I really don't know too much about the bullet button . Yes, we need photo's .
TacBlade Posted January 13, 2011 Report Posted January 13, 2011 R U using the button that requires you to use the tip of a bullet to eject your mag or is it a standard one? I just saw you used the term bullet button?
gunjunky Posted January 14, 2011 Author Report Posted January 14, 2011 Here are some pics sorry about the poor quality. Got a pmag today and it fits much better and the spring is not exposed to the mag catch. I also titened the button to refusal and backed it off one turn. (this law is BS)The spring is intragal to the button and neither very well. At this point I think all my issues are related to the button and the mag.Yes the bullet button is depressed with the point of a bullet or the tool.Thanks
survivalshop Posted January 16, 2011 Report Posted January 16, 2011 Looks like the mag release button is not screwed in far enough on the mag release in the photo.Which would not let it grab the mag slot or insert it with enough pressure to hold the mag in . If ya want more pressure on the mag slot on the mag ,use some thing to push the button in as far as you can push it & you will have to thread the mag catch into the button more ,but its a trial & error type of thing ,too much & the mag won't release & too little & the mag can fall out . Or is that the way this bullet button thingy is supposed to be ?
TacBlade Posted January 16, 2011 Report Posted January 16, 2011 My solution would be to move here to South Dakota, as there are plenty of houses for sale. Then you would not have to have one of those buttons!!!! I have some jokes today!!! I hope you get it working right, these little problems make a person frustrated, I know, I had a few with my build.
lt5captain Posted January 20, 2011 Report Posted January 20, 2011 You could use an Armalite AR10 catch. It has a longer threaded stud for better thread engagement.The catch portion itself is slightly taller.I have used this part on both CMMG and DPMS builds.Very happy with the results. It's about 12 bucks for the part. Works just fine with the Prince bullet button.
gunjunky Posted January 20, 2011 Author Report Posted January 20, 2011 Thanks I will order online tonight. I didn't know it would fit. Great tip!
gunjunky Posted February 6, 2011 Author Report Posted February 6, 2011 It has been a while but I took the mag pul, mag and the new ar-10 mag catch to the range and thanks to youall, both problems are fixed.I also spent some time inspecting the DPMS mags. They have so many issues I don't think ajusting them will make them work right.Mag pul mags and ar-10 mag catch are far better products than what they replaced $40.00 fix for $1200.00 gun. THANKS !
imschur Posted February 6, 2011 Report Posted February 6, 2011 Great!!I stickied this topic to benefit other shooters
Triggs75 Posted July 2, 2011 Report Posted July 2, 2011 Just assembled my cmmg lower and my Pmag would not stay in. I just now ordered the Armalite AR10 Mag Catch and hopefully that will fix the issue. Chad
imschur Posted July 2, 2011 Report Posted July 2, 2011 We have another thread about PMAGS in the CMMG's. It seems to not be a good combination
survivalshop Posted July 3, 2011 Report Posted July 3, 2011 My CMMG lower rifle will hold the Pmag ,but I get bolt over FTF. It seems others have used the Armilite mag catch with success to keep mag in position . Seems like a lot of tolerance differences with the CMMG lowers . Be interested in how yours functions with the Pmag & Armilite catch. I might try one my self ,just because it might help. Ya never know , the tolerance differences are very small .
gunjunky Posted July 4, 2011 Author Report Posted July 4, 2011 I have a CMMG lower and had the same problem. The Armlite catch fixed it, it reaches into the mag much deeper. Pmag helped to.
Triggs75 Posted July 15, 2011 Report Posted July 15, 2011 Ok. The ar-10 mag catch is the way to go. The main difference in the two is the ar-10 catch bolt has a slight angle inward. This is what makes it work cause when you place it in the lower and screw it down, it forces the catch to go into the mag slot deeper. I do not have an upper yet but my pmag is locked in there very tightly now. Chad
survivalshop Posted July 15, 2011 Report Posted July 15, 2011 I ordered a Armilite mag catch today , so we will see .I will be happy if it works . I will take another set of measurements when I install it .
imschur Posted July 15, 2011 Report Posted July 15, 2011 This is great stuff. Worthy of a small page on the main site <thumbsup>
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