G&P 39rd Magazine for G&P King Arms WA M4 Airsoft GBB Blowback Rifles (Color: Black)

"It's badly structured, with 2 big o-rings which are vulnerable to leaks.
Bought 4, 2 of them leak out of the box. A STANAG may be a better fit for GBBR.

"Amazing at first. I bought four of these mags, and I loved them for about four months. Then three mags started leaking. I bought a ton of o-rings and never got a good seal again. I just tried to caulk them shut. I have no clue if that will do it.

"Doesn't even fit on G&P WOC guns, which is basically the only gun it's made for since G&P doesn't really make other GBBRs.

You will need to file down this magazine on each side, and also file down your magazine well on the gun to make this fit.

But once you get it to fit, your problems are not over.

The magazine sits too high in the magazine well, so your bolt will not cycle back properly. It will get stuck.

So you will need to disassemble your gun, take out the magazine catch, and file down the upper portion of it so the magazine sits lower. But now the magazine is going to wobble because you filed down the part that keeps it secure, and other magazines might not seal correctly anymore.

This magazine is GARBAGE.

"I wasted a lot of money on poorly manufactured G&P gas blowback garbage this year. The G&P GBBR VPR rifle is garbage and these magazines are garbage. If you want a well-built GBBR, buy a KWA LM4 or even better the PTS model.

Also, let me be clear: these are not Magpul-built magazines. They may look like Magpul, but they are not.