Are you 100% sure it's blowback, and not ball stack clipping?
Also, is the bolt venting air out the front before it reaches its full travel forward?
Do you even have room on that front bolt section for orings? Looks pretty thin. Maybe a chamfer on the inner rear edge would help direct the air down and through the bolt rather than around it? You might also look at how tight the bolt is fitting the body.
Originally Posted by agentSmith
oldschool play is about sportsmanship and respect, oldschool gear is available on Ebay.
Last edited by russc; 07-10-2012 at 03:05 PM.