Golden Eagle MC-20 Magazine for G&P / King Arms/ Westrern Arms Gas Blowback Rifles

"I've had great long term luck with these JG Works made (GE Branded) MC-20 mags so far. I like the "WA" (Western Arms) GBB system that is VERY WELL hardened after 14+ years in use by several well known Airsoft GBBR manufacturers. It is I believe the ORIGINAL GBB mag system, and these JG Works MC-20 are a Clone of the best variant, the G&P ver 2 which Ares and S&T also use.

My oldest MC-20 is now 5 years old and still no leaks, with good care (NO DROPPING on hard surfaces) and maintenance. DO NOT ADD SILICONE Oil to Propane with these mags, or Green Gas with oil added. Take out the two valves once or twice a year and "bathe" the O-Rings in Silicone oil separately for a few hours, put on a paper towel for 30 minutes and then put everything back together.

I did have one JGW mag that came in a brand new "Golden Eagle" M4 MC6637 Elite Series 7 which the Gas Intake valve blew-out and its threads were stripped at the factory. Some Chinese worker probably drinking too much Baijiu on work breaks.

"Amazing mags. They are built like a tank, I have dropped, threw, and abused these mags and they work just fine. When u get them immediately open them up and put silicone oil in them and after that u are good to go. The last about 3-4 mags worth of BBs before running out
(unless u are spraying and praying) highly recommend 10/10

"Great Green Gas m4 magazine for the price. I haven't had any issues with it.

"Amazing product worth every bit. I just had a few problems

Pros
Worked well
Hold gas
Fit perfect in my S&T gbb m16a4 simple to use

Cons
Require finesse to fit perfect in MY gun

When I received mine they were leaky as in not
having been pressurised with gas if you come
across this problem I used some hater sauce from my paintball gear and some real gun oil to lube and that fixed my problem so beware

But all in all they are awesome

"Works good with the Matrix/ S&T M4 GBB Rifle, ran two reloads and no issues.