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Air Gun Home Forum Index » Antique, Collector and Novelty Airguns » Scope on Restored Crosman 140
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Scope on Restored Crosman 140 
PostPosted: Thu Dec 15, 2011 8:42 pm Reply with quote
Joined: 15 Jan 2008
Posts: 2997
Location: Coalmont, BC
I've had this idea kicking around for quite a while and today it finally got done.... I recently got some breeches from Stan / AeroTec to a design I did last spring.... I also received some bolts but without handles as I had to test the assembly and take a final dimension to know where to put the bolt handle so the bolt will lock up properly and seal the barrel.... Here is the result....

The breech is made from anodized 6061-T6 aluminum and looks nearly identical on the outside to a Crosman steel breech.... However, it is 5/16" bore and carries a 5/16" bolt instead of 1/4".... That was done to enable the use of the original rear breech plug and mounting screws from the "sliding cover" style breech used on the 140.... It even uses the same #007 O-ring as on the 140 bolt.... The transfer port and seal are from a 22XX and the barrel port area is countersunk to accept that.... The bolt uses an extended probe instead of the flow-through bolt style from the 140 as I have found they cause less restriction.... The barrel is fixed to the breech with two 8-32 set screws....

This gun has had the front of the piston machined off and replaced with a new flat topped piston carrying an O-ring.... That, of course, makes the pump capable of higher pressures, particularly at high pump numbers.... The gun shoots 495 at 4 pumps, 575 at 6 pumps, 630 at 8 pumps, and 680 at 10 pumps with RWS 14.3 gr. Super Hollow Points.... It has been completely disassembled and reblued and resealed, the stock was stripped and sanded to bare wood and refinished with 7 coats of Watco Danish Oil, wetsanded with progressively finer grade on each coat and ending up with 600 grit.... It then received 3 coats of Dark MinWax.... The Scope is a Fitco 2-7 x 32 AO which suits this light and compact gun perfectly....

I'm really pleased with the results.... Mr. Green


Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
.177 Diana 34, 1750 CO2 Carbine, .177 Uber-Pumper, .22 Uber-Carbine, .25 Discovery, 22XX PCP 8-shot Carbine, 2260 PCP Rifle (50 FPE), Hayabusa PCP, .22 B-26
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PostPosted: Fri Dec 16, 2011 8:47 am Reply with quote
Senior Member
Senior Member
Joined: 13 Dec 2008
Posts: 663
Location: USA
Nice mod to your 140. Looks like it came from the factory like that. You did a great job.

I used the barrel mounts 459MT for the scope on my 140, but they tend to rotate around the barrel a bit if I bump the scope. This throws off my point of aim and impact.

Your idea fixes that problem in spades. Great work.

Here are my numbers with 14.3's. Everything is stock inside this gun, it just has new seals and a valve from Alan Schweitzer.
5 pumps  500
8 pumps  570
10 pumps 635

Last edited by Crosman140 on Sun Dec 18, 2011 8:34 am; edited 1 time in total

My Critter Gitters
.22 Crosman 140 (1955)
.177 Crosman G1 (2009)
.177 Crosman 1377 (2009)
.177 Daisy 880 (1993)
BB Daisy Red Ryder (2012)
BB Crosman 1600 (1980)
BB Marksman 1010 (1979)
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PostPosted: Sun Dec 18, 2011 1:04 am Reply with quote
Silver Status Member
Silver Status Member
Joined: 28 Nov 2008
Posts: 3750
Location: Star, Idaho
Bob, not only are your pics always gun porn, we've yet to see any of your work you're not "pleased" with. Razz

Tim usually has a 140 on the rack when I go in.

I need to stay married. Laughing Nice rifle they are.

I believe in gun control,
If there's a gun around I
want to be controlling it.......
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PostPosted: Wed Mar 07, 2012 6:40 pm Reply with quote
New Member
New Member
Joined: 07 Mar 2012
Posts: 2
Great job.

A B-Square #17900 perfectly fits a Crosman 140.

I had to call B-Square and talk to a guy in the shop who knew their Russian, Baikal air pistol mount would fit the 140.

And that stock has me drooling! Shocked
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PostPosted: Sun Mar 25, 2012 1:27 pm Reply with quote
Joined: 29 Jan 2012
Posts: 16
Location: Florida
Nice work, Bob. Cool
Thank you for sharing.
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Scope on Restored Crosman 140 
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