Airsoft hop up chamber for Double Eagle / G&G UMP/UMG (DE M89)

thingiverse

my attempt to make hop up chamber for my UMP that having broken chamber and acquiring replacement is too pricey as it's not found locally for now it still have problem in semi where you have to delay another shot, if you tap it faster, the gun will having inconsistent result with 2nd shot but normal at 3rd, and having low powered again in 4th and normal in 5th and so on i put skp file in case someone wanna correct it and i will appreciate any constructive input due i just 3 month with 3d print for measurement, in fact this is close to M4 hop up chamber because i use m4 nozzle too