I installed this on my scar after the stock piston head broke. I paired it with a G&P polycarb piston and an s120 spring and I get over 50% better compression. Picture is decieving, it looks as it is hollow and thin. It is solid completely though, except for the groove to insert the O-ring.
Even though its not plastic or polycarb it is still pretty quiet. I would suggest tightening it very hard and re-enforcing it with loc-tight.
Great Product 5/5
O-ring is impressive
Easy to install
SOLID AS A BRICK OUTHOUSE! lol
No directions. But if you got the old one off you should be able to reinstall a new one.
Rating: [5 of 5 Stars!]