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Potshot
June 06, 2012, 00:25
Guys,

How important is it to have a press fit on the rear sight base to barrel?

I am building a Polish underfolder using a Romanian barrel. Fit in the rear trunnion is good, but the rear sight base ID to barrel rear sight base land OD feels like it has ~0.002" clearance.

Will the cross pin be sufficient to retain this or do I need to peen the rear sight base, get a new one, etc.?
yemff
June 07, 2012, 15:50
This is weird, I have exactly what you do and my barrel and sight have plenty of overlap for a good press fit. Did you get the barrel and kit from apex?
4duece
June 08, 2012, 00:19
Are the barrell parts you are useing,from a stamped kit or a milled kit there is a differance in dimensions.
gunplumber
June 08, 2012, 07:29
rear sight base should be .001-.002 smaller than the barrel. You can knurl the barrel journal to squeeze (literally) a little more diameter out of it. I'd do a ghetto spot weld at 6 o'clock before relying on just the pin.
Potshot
June 09, 2012, 12:53
Yeah, damn. 0.001-0.002 interference is about what I thought it should be.

Polish sight base on Romy virgin barrel. Mark, do you have any rear sight bases for sale?

Had a Bulgy 74 kit I had to demill this week.... damn thing must have had 0.010" interference on it! Bored the barrel to ~0.080" wall left and still had to use a hydraulic press to get it out.
gunplumber
June 09, 2012, 13:48
I have one Romy takeoff that does not slide over the barrel journal of the virgin romy barrel I just tested it on, so it should be tight.

$38.50 shipped
Potshot
June 13, 2012, 14:33
Mark, sorry for a slow reply.

I'll take it, thanks!

I assume a USPS money order would be easiest?
gunplumber
June 13, 2012, 14:35
yes, as would be a personal check made out to me.
Potshot
August 02, 2012, 23:59
Shit! Sorry Mark, been stupid busy at work and lost track of this. Do you still have the rear sight base? I also have an oversized Polish rear 47 sight base if you want it.
gunplumber
August 03, 2012, 09:01
I have one - I think it is Romy.
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Also have all the parts for a Bulgy 5.45 but only sold as a set. $150 - includes the barrel, but it wouldn't shoot straight so I replaced the whole thing. Maybe cut to a pistol?