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Crosman .177 Caliber Steel Breech Kit

Fits 1377, 1740, 1760 & PC77 Air Guns
Only $44.99
  • Save $8.00 (15%)
  • In Stock
  • Code: PY-A-4386 $44.99
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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
  • Condition New
  • Accessories Type OEM Repair Parts
  • Warranty 1-year limited warranty
  • Weight 2.00
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Average Customer Review
5.018 Reviews
83% (15)
17% (3)
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By MikeAugust 15, 2023 Verified Purchase

This really changes a 1377 or 1322 drastically for the better. My order was easy, and shipped expediently. Thank you, Airgun depot!

The steel breech turns a 1377 into a far more accurate and stable pellet gun


By LeslieJuly 19, 2022

This breech guarantees reasonable accuracy and reliability

This is an essential upgrade for any Crosman/Benjamin airgun with a plastic breech. Plastic breeches do not hold the barrel securely and does not even ensure the proper alignment of the transfer port. All of my airguns have steel breeches. Just wish someone made a multishot sidelever breech for these airguns. Actually, I do own two multishot breeches but both introduce their own set of problems.

Nothing . This breech is the perfect answer to a widespread problem

By BallcapApril 9, 2021

"1377 with stock and 3-9X40.." Steel breech kit, made a decent shooter a great shooter. By seat of the pants, more power... Sounds like more power in both exit of the barrel and the hit. Use Loctite on the bolt handle.. As for the void at the breech screw, I used Elmer's glue-all (took multiple applications to fill) for easy of removal if screw ever needs to be removed.. Now, no hang-ups of pellets during loading!

More accurate, with more power..

Breech is smaller, making loading a little tight with a scope..

By Chris USADecember 31, 2020

Hello, will this fit a crosman 262 model. I messed up the breech on mine and am looking to upgrade or replace it.

By EironUSADecember 20, 2019

Bought this for my PC77 and could not be more happy with it! The quality and finish are great and it Holds my Bug Buster scope in place rock solid! Already have put at the least a couple hundred round through my PC77 and it’s holding solid, no loosening or wobble.

Solid platform for any scope you want to use!


By Edwin K.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.

Steel, and brass. looks nice and fits and performs perfect

The 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.

By PaulAugust 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.

Long scope rail. Durable steel construction. Holes all lined up. Nice blued finish. All the pieces that you need come with it.

A little oversize on the bores for the barrel and the bolt.

By JerryUSAApril 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

Easy to install good instructions nice improvement for me

The bolt worked loose however I may not have tightened it enough.

By SteveApril 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 JosephJanuary 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.

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how can I get the parts for m&p 40 blowback slides

asked Marvin from USA

parts for m&p slide blowback pistol

asked Marvin from USA

Will this fit the Crosman 2240/2240xl.? Just a lot cheaper for .177 pellets, rather than .22. Just trying to see if this would work to convert the 2240 to a .177, Also, would a smaller bored barrel, be required or would the stock one be ok.?

asked Justin from USA

will this fit the 1322

asked gary from USA

Hi, does this steel breech come factory drilled and tapped for optics? Thanks!

asked Henny

I am wanting to change the CROSMAN 2240 .22 BARREL to a CROSMAN 1377 .177 BARREL. Can I use this breech to make the conversion with? Thanks in advance

asked Carlos from USA

Is it a rifled barrel ?

asked Dave C. Stout

If memory serves me, my 1377 came rifled some 30+yrs. ago. Stands to reason they are still produced w/ riflings.

Ray from USA

for @Joseph Brooklyn, the description says will not fit older Crossman with breech sliding cover. Your pic's appear to be the older model. If it is (the older model) any special instructions to someone who also has an older model

asked David R
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