Breaking the hinge pin on my Bomar Sights

Kreech

Kreech

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Ottawa - NCRRA and RA
Hi All,

I shoot 1911's in IPSC and have had a problem of breaking the hinge pin on my Bomar (rear) sights.

I have a Para/Caspian and an SVI, and I've broken the pins in both of them.

The loads are basically the same 4.2 and 4.3 grains of Clays behind a 230gr Frontier bullet, and large pistol primers.

I've got 14# or 12.5# springs in them (can't remember now...), and no shock-buff.

Has anyone else had this same problem?
Should I try running with a shock-buff?
Is the pin breaking upon recoil?

I've tried to use drill rod to replace these pins. Cheap drills don't work, expensive drills work for a while, but still break.

The Bomar on the SVI had the pin staked in place, but it still broke, and still came loose (and fell out on the floor....).

I have both halves of the pin, and with a bit of the good-old duct tape, I can keep them in-place, but this is NOT a recommended accessory for an SVI... I get far too many strange looks and "colorful" comments when I show up with my pistol in that state.

Does anyone know how to
1) stop this from happening
2) get some replacement pins

Thank you!

Sean
 
Ooopps, forgot to add that you may need to stake the ends of the pin once placed to keep it from moving. I have had this problem with my Springfield .45 and that seemed to correct things.
 
If I use a shok-buff, then I'll shorten the travel of the slide upon recoil. What is the general opinion on whether or not this is a problem with extraction?

If there is an unfired round in the chamber, is it going to allow it to extract?

I'll go install one today and try it.

Sean
 
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