GHK 50rd Gas Blowback Magazine for GKS74U Airsoft GBB Rifles

"I have 5 of these and they've all worked flawlessly ever since I bought them. No leaking on any of them, they arrive pressurized to maintain a good seal. Have put roughly 3000 rounds throughout the 5 mags. Nothing but the best with GHK.

"So far so good. Although the mag is quite heavy like most gas mags and the feed lips are quite stubborn , this mag is the only one that will work well in HTS Groza.
As other reviewers have noted, you will need to modify the feed lips a bit with a small file, however once your done and in conjunction with a Samoon BB loader attachment, you'll be right as rain.
The gas consumption is quite heavy on this mag so do make sure to fill up at least 10 seconds of gas for one game. Also when not in use, make sure to apply silicon lube to all valve ports and openings to keep them fresh and uncracked, as well as keeping a bit of gas inside of them.
Otherwise, a solid mag for a solid price.

"Good mags. First 4 I bought all work great. I used a 5/32 or 4mm file. After the mod they load and feed a lot better. I did not bother to even try with them unmoded.

Pros:
In USA
Cheapest on the Internet anywhere with discount

Cons:
Slight mod needed

"Bought 4 of these. The magazine holds up on green gas/propane at 70 degrees Fahrenheit with zero leaks.. These are a pain in the behind to load with BBs. Modification is needed on the feed lips of the mag so it can be loaded with ease. A circular file or a totary tool with the proper bit will do the trick. The opening on the feed lips just need to be opened up a little bit. Holds 48 rounds. Samoon recomends that magazines should only be charged for about 6 seconds and that putting gas in it for longer than that may produce adverse effects.