MY MRODAIR VARMINT .22 IMPRESSIONS

[Bob Pratl]

I didn't think it was necessary to add vent holes. I used SAE drills to bore the holes because I don't own a mini solid carbide boring bar that I needed to make the 2-1/4" deep hole for the smaller diameter of the stepped barrel, so the holes are slightly oversized enough for the air to escape out the back. I may remake the adapter closer to the barrel size steps if I can find a good price on the boring bar. Regular steel boring bar that small in diameter would flex being that far out of the tool holder on the lathe.

I do have some very small boring bars for my lathe but they flex too much if boring a depth > 1" so I just purchased a 13/32 - 7/16 adjustable reamer to be able to size it to 10mm.
My Crosman parts will be here on Thursday...I hope. Bob