My buddies "spare parts" bottle build

The Missus spied 7 tree rats on the deck this AM, and for once didn't think they were cute. I took note and proceeded to go down the hill to sight in a bottle build I put together for one of my high school buds.

Yep, had a dumb one saunter out into my shooting lane and pose within 6 or 5 feet of my 25 yard target. You know the rest -



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I really did have all of the parts with exception of the drop block, very generously donated by AGN member Wait_what, and I will pay it forward breaux!

Regged at 1500 psi, doing 17 fpe or so. Waiting on a P-Rod hammer spring, safety, spring & bearing from Crosman, and a pa from Charles Mellon. The trigger right now is awful, but I'll get that sussed -
 
She now has a working safety, and with some lube in the right spots the single stage 2240 trigger is much better. Also changed out the barrel to an 18" unit, grouping better w/o fliers. Re installed the original valve spring, two #11 o rings between hammer & valve.
How about a little info on that o-ring mod sir?

Thx
Ray