Very carefully and pay attention to how the bolt catch actually works, if you did you should figured it out almost immediately. and might have several still in the packaging. https://www.luth-ar.com/product/buffer-tube-spring-assembly-kit-308/, Bolt catch is from a TacFire .308 AR Lower Parts Kit (not for an AR-15). If that's what the bolt catch is suppossed to look like then my mags are a lil out of spec when inserted into the lower. For a better experience, please enable JavaScript in your browser before proceeding. The Fix: 1.) Paste as plain text instead, Insert the steel DPMS mag and lock the bolt back and look through the ejection port and note how much of the bolt face the bolt catch covers. It's not the bolt catch, itself, obviously. Snipers Hide is a community of Snipers of all kinds, focusing on long range shooting, accuracy, and ballistics. I was curious about how other magazines behaved in the lower so I measured them to simply verify reasonable consistency. Once bolt was locked to the rear or closed, it would engage the catch and seat properly on the "bad" mag. Pmag Problem | Northeastshooters.com Forums If the solution to the feed problem involves a modification to the upper or lower, Ill test the bolt catch and take another measurement as shown in figure 6 (not figure 5). PMAG "bolt catch interference" Issue with LMT MWS Using PMAGs can actually do irreparable damage to an FN SCAR rifle. Not trying to be a dick, but can you summarize in one sentence what the rifle is NOT doing? The problem apears to be that the mag follower tab does not protrude out the back of the mag far enough, the follower wants to ride more forward in the mag body, and the end of the catch tab is not lifted upwards to active the catch. *Must have a registered ARFCOM account to win. Take off your upper receiver, throw in that empty mag. Cookie Notice A new one can be sent upon request. We have also seen similar malfunctions in a sandy environment using military spec ammo with a dirty, gummed up weapon. The bolt passes over the cartridge instead of stripping it from the magazine. Has anyone seen this? Personally I wouldn't shoot it until you've got this issue corrected. This clearance is partially determined by the use of aLuth-AR .308 rifle buffer tube, spring, and weight [https://www.luth-ar.com/product/buffer-tube-spring-assembly-kit-308/]. It was initially 0.323 deep. I suspect yours will be higher than mine. The mags cause the bolt catch to rise ever . 7: Bolt catch fully extended, plunger removed = 0.443, Fig. Could use some advice, being this is a problem on MANY ARs, not just the M&P's. How To Fix AR-15 Bolt Catch Lock Failure for PMAG's Founded by Frank Galli in 2000, Snipers Hide has been offering informational videos, podcasts, and other support to its users in one location. I recently assembled this Noveske rifle and bought 3. Not a back-breaking amount, mind you, but not insignificant. 6: Bolt catch fully extended = 0.359, Fig. I've heard of Issues with Pmags and ARs due to Pmags having more material on the rear of the mag, creating more distance between the follower and the Bolt Catch tooth which isn't as far with USGI mags, and wondering if it is that, plus tolerance stacking being my Catch has so much wiggle room on the Standard M&P.

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