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K thanks for putting it in,
There are several factors contributing low fps Let me go through all of them and how they look, if you still cant figure out I got a clear lower WOC which can help
1) Hopup buckling torn
2) Nozzle Unit Damage (exterior) look for any damage, if it has chip part replace it, unless its steel/ aluminium
3)Valve Knock positioning via mag catch, take off upper, cock hammer put on safe, insert magazine see if the knock lines up to the valve release. Then hold firming on the hammer, release it via trigger pull. Don't let it go see if it still line up. NOTE: I would strongly recommand that the mag is empty of gas, and you are wearing goggle. Its not fun when Gas goes into your face/ eyes. If it does, get to the bathroom, rinse it with cold/cool water for 10min with eye lid open. If its still bad 10min after wash, go see your doc or medi center.
4) Hammer Spring V1: Check if the hammer spring's feet (two ends of the wire) are place directly on top of the trigger pin. If it isnt remove the hammer and adjust it. Doing so can change the fps by alot (510mm 6.08 inner gives fps 290 with the feet at the bottom of receiver, and 450 when its position (right) on the trigger pin.
4 Hammer Spring V2: Remove the hammer spring squish like how hammer compresses it. If it feel really really easy to squish 1 handed (strong side) to the same compression as the hammer goes. Replace the spring. (this is usually what happens if you leave the gbbr's hammer cock too long)
5 Hamme Spring V3: Remove upper, cock the hammer, set on semi, and fire. If the hammer hit the valve knock sounds like:
*single Clack extremely loud, You are using an AR-15 Hammer spring, don't use it. It will destroy your receiver and firing block
*2-3 Clacks moderately, this is normal
*5++ clacks moderate-quiet, replace hammer spring its worn
*If it doesnt even release the hammer to push the knocker all the way out, you got a really really reallyr really dead/worn hammer spring. (shouldn't be the case for you)
I'm suspecting your hammer spring is the problem.
PS: The reason I want you to fill your profile is simply some work on your end. It really pisses me off when a noob comes ask a question with account created the same day and never replies.
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