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Crosman .177 Caliber Steel Breech Kit

Fits 1377, 1740, 1760 & PC77 Air Guns

Crosman .177 Caliber Steel Breech Kit

Only $36.99
  • List Price $39.99
  • availability In Stock
  • Code: PY-A-4386 · · ·
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The original rear sight that comes with any of these airgun models will no longer fit on the steel breech. If you want a rear sight, the Crosman LPA MIM rear sight is made for this kit.

  • Fits Crosman airgun models 1377,* 1740, 1760 and PC77
  • Will accept the Crosman LPA MIM rear sight

*This breech does not fit older model 1377 air pistols with a sliding breech cover.
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  • ManufacturerCrosman
  • ConditionNew
  • Accessories TypeUpgrade Kits
  • Warranty1-year limited warranty
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Crosman .177 Caliber Steel Breech Kit
13 Reviews
77% (10)
23% (3)
0% (0)
0% (0)
0% (0)
100% Recommend this product (13 of 13 responses)
By Edwin K.
Drums Pa
Replaced Aging plastic breech that failed
April 16, 2019
As the headline says the breech replaced the 20year old breech that had the probe fail on me and break in two pieces. So I had to upgrade. Oh, I have the breech they say cannot be swapped out with this one. I don't know why they say that, works fine.
ProsSteel, and brass. looks nice and fits and performs perfect
ConsThe probe seems to fit a little loose, i will replace the o-ring to fix that. Cannot mount old peep sight. I really do not like the scope on the gun.
Best UsesCrosman 1377
By Paul
Honolulu, Hawaii
Nice part, nice price. Worth the wait.
August 21, 2018
First impression is that the finish on all the parts are a deep, even, dark, blued finish. Checked the contents of the baggie and everything was there including the Allen wrenches. The fit of the bolt is a little loose but it works. The bore for the barrel is also slightly loose, most likely to prevent binding, and was not a problem as, I turned a sleeve to fit nicely in the breech and over a 5/16" barrel liner. All of the holes lined up and the 7/16" radius was accurate and straight. The dovetail for the rear sight was sharp. Some may find that to be a good thing but be careful to not get cut if you don't fill it with a sight. The counterbore for the #4-48 screw in the loading trough is a bit bigger than the screw head and it catches on the pellets when loading. A drop of wax fixed the problem.

I bought this because I needed to find an affordable solution to repair a Crosman 1389 that I picked up at a local gun show for $10.00. The loading port parts are unobtainable and even if I could get them, the accuracy was erratic because of the inconsistent port seating. The pellets would deform as they found their way down the forcing cone. So, for less than $50 and some of my machining time, I was able to make a silk purse out of a sow's ear. 5 shots make a ragged hole at 10 yards.
ProsLong scope rail. Durable steel construction. Holes all lined up. Nice blued finish. All the pieces that you need come with it.
ConsA little oversize on the bores for the barrel and the bolt.
Best UsesUpgrade an obsolete breech.
By Jerry P.
Manhattan, KS
Steel breech upgrade
April 23, 2018
So far very happy with my purchase my crosman 1377 feels tighter and now accommodates my scope. Only fired about 50 rounds so far holding accuracy very well
ProsEasy to install good instructions nice improvement for me
ConsThe bolt worked loose however I may not have tightened it enough.
By Steve
Rochester, NY
Steel breech
April 14, 2018
To bad Crosman does not put this on from the factory. Now I can put a red dot sight on. Just be careful when changing this you don't loose the small fitting between the breech and the air chamber, it will fall out when removing the factory breech. Fitting only fits one way.
By Joseph
Works great. I need 18" or 21" pipe .177.
January 8, 2018
Good for money pay off. Work good on new crosmen. But still like the old crosmen with bb. Work on rats and racoon. When you grow plaints we understand you need a crosmen to have around.
By Thomas
Westport, Indiana
Must have on 1377
December 26, 2017
Makes my 1377 look much better without the plastic breech that comes stock. Tightens the gun up and allowed me to add my crosman pistol scope. A must have for these guns. Plan on purchasing one for my 1322 soon.
ProsGood quality. Easy install. Makes the gun the way it should come stock. Tightens the barrel up and makes it solid.
By Old G.
near Oakland CA
Needs Better Instructions
November 4, 2017
The instructions were a bit hard to follow. They said that there was a seal that fit between the barrel and the breech, but there was nothing around that looked like a seal. Finally realized that the seal was the TINY metal piece that fell on the floor when I disassembled the gun. Instructions should mention that the seal is metal, will automatically fall out when you take the breech off, and although it will fit into the barrel either way only one way is correct (if pellets won't fire when you're done, you put the seal in upside down). Only other problem was that the dovetail in the breech is slightly too large to fit the sight that Crosman recommends and sells; I had to put a very thin brass shim in the bottom of the dovetal to make the sight secure. Not sure if the problem is the breech or the sight but both came from Crosman.
ProsOnce you figure it all out, pretty easy to install. No special tools required (other than the allen wrenches that come with the kit). Should be more accurate than the stock breech as the new one is quite a bit longer; I'm not a good enough shot to really tell.
ConsInstructions and dovetail.
By Robert
Santa Rosa, CA
Awesome upgrade
August 30, 2017
This breech was a snap to install, and I love the weight and balance it brings. The long dovetailed top let me install 4-7x 32 optics's to shoot dime sized groups with cheepo pellets.
ProsPerpendicular dovetail at rear for Williams peep sight
ConsBreech plug protrudes too far to allow reuse of factory sight (no great loss.)
By Richard
Bullhead City, AZ
Great improvement over plastic
August 10, 2017
Took no time at all to install, really easy since the instructions are a little poor. As well as loading pellets much easier for my chubby fingers, it hold the pistol scope SOLID with no wobble and with the addition of a set of target sights (iron sights only matches) everything is working great.
ProsJust what I wanted and at a price lower than I expected. As a old shooter, much easier to handle than the OEM.
By Frank F.
Lahell Florida
Nice add on
June 13, 2017
Nice accessory, gives 3/8" rail for scope. Easy to install
By joe
upgrade is awesome
May 15, 2017
this add on part makes the "toy" feel more like a "gun", added a laser adaptor and added a screen dot as well.
By Robert
Loveland, CO
Excellent Upgrade
June 24, 2016
This steel breech is easy to install and of excellent quality.
The only down side is that the stock rear sight no longer fits on this breech but I knew that when buying it and have a scope that I will be using in place of the open sights.
Pros11mm Dovetail allows for scope mounting that original breech does not.
ConsNot truly a con but you can't use the stock rear sight with this breech unless you do some modifications to the sight.
By rcrochte
Las Vegas, NV
Better than stock enhancement
September 22, 2015
Installation of the steel breech kit was fairly quick. Gives your pistol a nice custom upgrade
ProsSmoother breech action. Mounting rail allows for a variety of optics or sights to be used.
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