Guarder Bore-Up Air Seal Nozzle for M4 / M16 Series Airsoft AEG

"Just received this and installed it. Fits great.

FYI - There is an O-Ring inside. Nearly invisible, but there is one.

I discovered by accident while installing or I would have never looked.

"I purchased this part for my G&G CM16 Raider after I broke the stock part during disassembly. It fits perfectly in my gun. The only problem I have with it is my gun was shooting 335 FPS before and after it's shooting 325 FPS.

Pros:
Fit perfectly
nicely made

Cons:
actually lowered my FPS