Guide: M416 Rifle PMag Mod

[Knocturnal]

I recently purchased a G&G TR4-18 Short, which is a M416 variant. Along with my TR4-18 I got 12 of KWA's K120 Polymer mags, which are basically the same (quality and aesthetically wise) as the famous Magpul PMags everyone drools about (which are no longer on the market). Quality PMag's are hard to neglect, and KWA has done it with their version of the PMag. However, the M416 magwell is slightly different than a standard M4. You will need to modify the mag for them to fit. This mod will not hinder the performance, look, or compatibility with your other rifles using standard NATO 5.56mm mags.

KWA K120 Polymer mag


The reason why PMags do not fit the M416 magwell is due to the lip on the upper part of the mag, right above the last finger grove.


All you will need is a file, and large tie wraps. Optionally, electrical tape to increase the mags girth and tie wrap traction. I added a few layers of electrical tape to the mag, and sat the tie wrap leaning on the lower lip of the last finger grove. As such


From this point on, you file down the polymer until the lip is close to being completely gone. The tie wrap serves as a guide for a new and perfectly straight lip. It took me around 5 minutes per mag. I left some of the lip, this way the mag sits tightly into the magwell. These KWA PMags allow for barely any wobble if any at all, the best I've seen so far (with the exception of Magpul's own PMags).


The finished product shows no signs of modifications, sits tight in the magwell and with no feeding problems.


I recommend you use a aggressive file to shave down most of the lip, the polymer on these mags in particular is rather hardcore, you can finish off with a softer file.

I went around searching for guides on PMag modes, but none of them ended with good aesthetics. I don't recommend using a dremel, but you may if you don't care as much about the aesthetics and want to save some time.

[blanc_bec74]

Thanks for the tips knocturnal and good post. I have used a Dremel for my mags and have had excellent results.

[Dynamo]

i just milled my mag well. all pmags fit without modification now.

[chrisbirley]

Dynamo - do you have any pictures of how much you modded your magwell. im looking at doing the same - makes getting mags so much easier. thanks

[jomor]

I love reading on how people have modded things. Good job and thanks for posting this to help other airsofters out! I will be using my dermal on my mags.

[Dynamo]

[jomor]

Doesn't that make for a loose fit with stanag mags? Or do you only used pmag style?

[Dynamo]

Originally Posted by jomor

Doesn't that make for a loose fit with stanag mags? Or do you only used pmag style?

no change in the fit of stanag mags. the size of the magwell hasn't changed, just that front edge. the 416 magwell has a shallower angle to it, so standard pmags hit the front edge of the mag well and wont seat. with the change i made to the front edge of the magwell, the pmags can insert high enough to seat properly. personally, i think what H&K did with the 416 magwell is stupid.

[mr_nuts31]

Originally Posted by Dynamo

no change in the fit of stanag mags. the size of the magwell hasn't changed, just that front edge. the 416 magwell has a shallower angle to it, so standard pmags hit the front edge of the mag well and wont seat. with the change i made to the front edge of the magwell, the pmags can insert high enough to seat properly. personally, i think what H&K did with the 416 magwell is stupid.

Which is why the EMAG exist.

[Dynamo]

Originally Posted by mr_nuts31

Which is why the EMAG exist.

again, pointless to even need it. the AR15/M4 magwell is fine, and there was no need to change it other than making it different for the sake of making it different.

[#lovemachine]

D, would i need to have this done by a millwright or would it be possible to do it myself slowly/carefully with a file?

[Dynamo]

Originally Posted by #lovemachine

D, would i need to have this done by a millwright or would it be possible to do it myself slowly/carefully with a file?

can be done with a file. i milled it my self with my hobby mill. if i didn't have one, i would have used a file. it's only pot metal, so it's not that hard.

[#lovemachine]

cools, thanks for the tip.. gonna hafta go do that with mine now!