These are adjustable so you can fine tune the back pressure for the blanks you are using to ensure cycling. They are a blast for firing blanks on the 4th of July, New Yrs or whenever it tickles your pickle but you have to have one if you want your HK G3/ 91 and or clone to cycle the blank. Be aware that if you have a PTR91, the latest versions have a muzzle thread that is different from original HK and these will not fit.
Happy New Year!
I have welcomed the new year in for the past few years with this and one for an AK. The G3 is a bit louder and really a lot of fun! Me and a few friends get together and have a 50yd fire fight!
These are kewl
These are fun if your into blanks and making noise, they are loud as sin and hold enough back pressure to cycle the gun even in F/A mode
Really neat piece to have to go with your gun