Had to remove the magnets from the action/cocking mechanism. They came loose and caused the mechanism to block… parts are machined after anodization. Probably a last minute upgrade from m3 to m4.. Other people having this issue?
Yep.. there are some good disassemble and reassemble videos on you tube. You do not need a lot of special tools. Just time and patience (and a large clean table to set aside all the components.)
Please Search for Valve rod. I had same issue. Took it apart and cleaned and polished the valve rod, Exchanged the o-ringsi n the plenum and polished and lubed the hammer, spring. Seams like this solved It..
Quick update from my side. I own a M4 sniper and had the same slow 10-15 first shots. importer in the Netherlands would not admit a problem with the gun.. and decided to take it apart en inspect the valve rod. lot of black gunk in the valvetube end and related orings. Polished the valve rod...