Hammer/Sear Pins from toolbox

[jpgonzalez]

I started following the clinic threads. I wanted to look closer at the fit of the hammer hooks to the sear. I made up a frame mounted pin for the hammer similar to the commercial stuff. The sear pin was giving me frustrations as I was machining so I looked at Plan B.

I checked my drills, and found I can use 7/64 or a #35 drill shank for the sear, the 5/32 or the #21 would make a close fit to the frame. I am able to view the hammer/sear contact externally.

One of the sear pin frame holes looked like it walked a bit.

Has anyone used any other stuff in the toolbox?

JPG

[Hawkmoon]

I bought the pins from Brownells. They have a wider body where the pins enter the receiver to hold the hammer and sear clear of the side of the receiver. I think it was money well spent.

[jpgonzalez]

Thanks Hawkmoon, I was trying to fabricate that design. The hammer pin being a larger diameter wasn't too much of a problem. The sear pin at smaller diameter gave me a problem when cutting it out of 316 stainless. I am just using the pwer tools that I have accumliated over the years.

[Hill]

I have sets of machinist gauge pins anyway so I just select one for each hole right on the gun frame. I used to just poke the pins through pieces of paper to keep the trigger parts off the gun finish, but finally made a couple of setscrew locking collars for each pin. The pins are hardened and are dimensioned +.0005" and -.0005" for each size (three pins for each hole). Bought the sets at a machineshop auction years ago.

Sounds like you've got a lathe available - easy stuff with a lathe, high speeds, slow feeds, and small cuts. By the time you finish you'll wonder why you didn't just order the Brownell's pair. Money is easier to get than time is.

[Greg Derr]

Marvel Custom in Maryland sells oversized pins, Us them with a #33(sear pin) Reamer and a #21 (hammer pin) reamer. This will give the best fit with little shaft play. The frame hole chamfer is 60 degree. Greg