3vi1-D4n Posted November 6, 2018 Author Report Share Posted November 6, 2018 Old WE GBBRs such as the MP5/MP7 had overly strong rocket valve springs and recoil springs. Rocket valve springs can be chopped by 1.5 rungs while recoil springs can be chopped between 30-40%. That will increase the efficiency. And no its not the #049 that eats away at the bolt, it is the hammer. Quote Link to post Share on other sites
Dimitri MdP Posted November 7, 2018 Report Share Posted November 7, 2018 On 11/5/2018 at 5:11 PM, Zereck said: Currently I have the issue of the gun freezing fast. You can feel the gun shooting weaker one-by-one until it just spews all the gas out. Maybe first-gen mags? (the ones with lower gas routes) Quote Link to post Share on other sites
Zereck Posted November 9, 2018 Report Share Posted November 9, 2018 On 11/7/2018 at 11:30 PM, Dimitri MdP said: Maybe first-gen mags? (the ones with lower gas routes) Nah. I switched those out as soon as I got it. 1 Quote Link to post Share on other sites
Dimitri MdP Posted November 9, 2018 Report Share Posted November 9, 2018 Then it's either a worn out nozzle to bolt carrier oring, or the nozzle is disconnecting prematurely from the bucking. That should be easy to check for, just pull the charging handle and see if it stays coupled to the chamber for a couple cm then snaps back, or it just wants to follow the bolt carrier Quote Link to post Share on other sites
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