GTA
General Discussion To Gateway To Airguns => Gamo Gate => : LongIslandArcher February 18, 2010, 04:06:44 PM
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Well, my Theoben gas ram finally arrived today.The installation was a bit time-consuming because the Theoben gas ram goes into the rifle backwards with the gas ram body sliding into the piston sleeve. I also had to wrap the gas ram body with masking tape to 20.5mm dia. in two strategic places (with a bit of trimming) so it sits perfectly centered inside the piston sleeve and out of the way of the sliding cocking arm. The rod end of the gas ram comes with a couple of washers and a panhead hex screw that sits against the retaining block (at the end of the receiver tube).
This rifle put wadcutter pellets through a 3/4" piece of pine - something that my Crosman NPSS could NOT do. I am guessing it's because of the way the gas ram is situated - putting more mass into the moving piston thereby putting more energy into the pellet. It also feels calmer and sounds quieter than the Whisper gas ram I had in there. I am going to put the rifle through the chrony this Saturday and see what numbers I'm going to get.
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That's awesome! Keep me posted. I was thinking of doing that to one my CFXs too. I'd be interested to see how consistent it shoots.
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Oh, one thing I forgot to mention: I removed the extra scope rail that is mounted to the dovetail on the receiver tube. I then took my 1-piece scope mount and tapped an 8x1.25 threaded hole through the existing set screw hole in the scope mount. This allowed me to take the larger 8x1.25 set screw I took off the extra scope rail and use it directly on the scope mount to the receiver tube. My experience has been with the original tiny set screw that comes with the scope mount to be inadequate for these high powered air rifles. I took off one set of rings one day and the tiny set screw was actually bent as the scope mounts started creeping backwards along the dovetail. I couldn't take the set screw out, so I just tapped the new hole right through it. With medium scope mounts, a scope with a 44mm objective bell sits 1/8" above the top of the receiver tube, leaving just enough room for a flip-up cover. I did this with all 3 of my CFXes. No more bent scope mount set screws and my scope no longer creeps backwards. And most importantly, no more torn set screw hole on the receiver tube.