I bought ten PMAGs last year (dated 7/07) and right out of the box five of them wouldn’t drop free from my LMT lower. After one or two trips to the range they all dropped free. Whatever excess material there may have been on the PMAG body didn’t last long. If I had a mag that had been used a lot and still wasn’t dropping free then I’d be concerned, but with a brand new one frankly I wouldn’t worry about it.
Maybe you got a bad batch of Magpuls, that or your LMT lower is out of spec. Colts I have played with do just fine with the Magpuls. Then again, I bought the window’ed version and I have heard they drop free a little better for whatever flukish reason.
If you have a PMAG™ with 7/07 or 8/07 mfg date, there is a tuning procedure you can perform that may help improve drop free performance. On these magazines, additional material is present on the front face of the Feed Tower Front Wall (see below). This added material can interfere with tighter magazine wells (front-to-back) causing some drag. Be aware that Magpul cannot guarantee the results of any modification and anyone performing said modifications do so at their own risk.
PMAG™ DROP-FREE TUNING PROCEDURE
STEP 1 - BREAK IN
Break in magazine by inserting it into the magazine well numerous times (20-30 or more). Do not continue further once magazine starts to drop free. If the magazine does not begin to drop free readily, look for wear spots to determine any areas of interference. If the front or back of the magazine Feed Tower shows wear then proceed to STEP 2. If wear is present on the small Front Transition Angle between the base of the Feed Tower Front Wall and the Top Rib proceed to STEP 3.
STEP 2 - FLATTEN FRONT FEED TOWER WALL
Using a flat file, lightly remove material from the front face of the Feed Tower Front Wall. Concentrate on high spots underneath Feed Relief Cut and around and underneath the Feed Tower Molding Gate. Be careful not to remove too much material! The maximum amount that should be removed is enough to make the front face flat (planar). Test magazine often for drop-free ejection. Do not continue further once magazine starts to drop free.
STEP 3 - ADJUST FRONT TRANSITION ANGLE
Using a round file, lightly remove material from the small Front Transition Angle between the base of the Feed Tower Front Wall and the Top Rib. This area is located approximately 1/3 of the way down on the FRONT of the magazine. Concentrate on removing material in the downward direction (as the magazine normally sits in the weapon). WARNING: DO NOT dip underneath the surface of the Feed Tower Front Wall as this can create a very thin area in the magazine and structurally weaken it. Test magazine often for drop-free ejection. If necessary, repeat STEP 1 – Break-in and look for interference/wear areas.
You can try this if you want, or we’ll just replace the mag. If you somehow manage to destroy your mag, just let me know and I’ll send you a new one. Shoot me an email if you want me to help get this resolved: nick@magpul.com.
No problem, mate. I don’t do business with manufacturers who won’t stand behind their product, and neither should you. If the problem is caused by our gear, it will be taken care of, no questions asked. The buck stops here.
Send me an email with your physical address: nick@magpul.com. I’ll toss some stickers in the mail, along with a catalog for your trouble. We should have some new stickers in the relatively near future, too.