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Both are 3rd gen mags and have been super finicky in my experience (unless it's just user error....) 

I tested with both mags (one with an oring and one without). I can get to 20g of gas for the mag with the oring, but the stock mag seems to max out at 8-9g before gas spews....

Ok here's what I tried. There's a definite improvement and I'm now able to get through half the mag before they dump gas (previously I was only able to get out 1 or 2 shots). I was only able to get through a full mag once across 10 or so attempts over the last few days.... any ideas?   Steps...

Thanks guys - appreciate the responses. I have tried purging previously with no success, will give the other recommendations a try later today and report back. 

Having a bit of an odd issue with 2 MWS mags on my mk18 - one is bone stock and the other has an oring dropped into the fill valve. Being able to unload both mags just once after filling with green gas is a crapshoot. I can get 1 or 2 shots in before the mag discharges and dumps all remaining...

Man - you guys are the best. Thanks for all the responses. @Davegolf - Thanks so much. I will PM you for details. The grip is not a clone as far as I can tell - it did mate well to the receiver and only "wobbled" after this happened and the bolt came loose. And LOL yes this is what inspired my...

Hey guys. Received my TM MWS (mk18) yesterday and happy to be joining the MWS gang. I swapped out the stock grip today for a magpul K2 and noticed alot of wobble after some use. Attached is what I see after removing the grip. I'm super disappointed (mostly at myself, I assume I may have...