Date: 27/1/2023 21:45


Crosman .177 Cal Steel Breech Kit & LPA Rear Sight

4.5 (16 reviews)
Crosman .177 Cal Steel Breech Kit & LPA Rear Sight

Crosman .177 Cal, Image 1

Share your images


List Price $99.99Save $10.00(10%)

  • 1-year limited warranty

  • 60 day money back guarantee
  • Estimate Shipping

Add to Compare
Add to Wish list

Earn 90 Bullseye Bucks

Please Note:

Updated selection based on available products

Pre Order

Out of Stock

Estimated in-stock date 02-13-23

Notify me when product becomes available

Sold & shipped by PyramydAir

See other products by Crosman

Item details

Sold & shipped by PyramydAir


Out of stock
Estimated in-stock date 02-13-2023. Place your order now for delivery priority!
No need to get a whole new gun when you can just upgrade your Crosman 1377 pistol with Crosman's steel breech and LPA rear sight. Want to mount a scope or dot sight? The steel breech is strong enough and has a dovetail to accomodate one. The LPA rear sight will aid quicker target acquisition.

Crosman .177-caliber steel breech kit and LPA rear sight
  • Crosman .177-cal. steel breech kit
  • Fits Crosman airgun models 1377/PC77
  • Will accept the Crosman LPA MIM rear sight
  • Crosman LPA MIM rear sight
  • Adjustable for windage and elevation
  • Does not fit 3/8", 11mm, Weaver or Picatinny dovetails/bases

Item Code: PK-BR-UP-177 [PY-A-5378]

Average Customer Review

4.5 (16 reviews)
5 star
4 star
3 star
2 star
1 star
10 reviews
4 reviews
1 review
1 review

Create an online review

Customer images

Sort by Date: Newest–Oldest

3.0 3.0

3.0 3.0

Things I liked:

Look and feel much improved over plastic version. Positive click adjustments on upgrade sight. 3/8" dovetail for future optical upgrades. Factory (well, Pyramid) installation is seamless. Pyramid sends the stock parts that were changed out without being asked.

Things I would have changed:

Bolt Handle constantly unscrews under normal use. Torquing it (5-6 ft-lbs; it's only a small diameter thread) didn't help. Loctite, maybe? I hope the threads don't tear out! The upgraded bolt handle is heavier than the stock version. This makes the bolt tend to move forward and get in the way of loading if you have the muzzle pointed even a little down. Could Pyramid maybe install the stock bolt handle on the upgrade breech during the changeout process? Included MIM sight does not lower enough to put Point Of Impact on Point Of Aim?!? Mine hits about 1.5" high at 7 meters, with the rear sight bottomed out. White dots on rear MIM sight makes for a poor sight picture under indoor conditions. (5 seconds with a Sharpie marker fixes that, though)

What others should know:

What others have said about loading difficulties is true. A little dexterity and some practice are needed to get around the issue. My method: Point muzzle slightly up with bolt open. (so gravity keeps bolt open) Drop pellet into rear of loading groove. Slide pellet against bolt nose if needed. Gently holding pellet against bolt with finger, point the muzzle vertically down. Release pellet to drop into breech. The bolt will follow under gravity influence. Ensure bolt is locked; pistol is ready to fire. (You can retract the bolt to verify correct orientation of the pellet, but i rarely (never?) find problems if I wait until the pistol was fully vertical to release.)

5.0 5.0

5.0 5.0

Things I liked:

The sight is the main reason to upgrade, I purchased it with the gun so it was already install when I got it, what else can I say steel or plastic with a sight that's not dove tailed and isn't easy to adjust, you choose.

Things I would have changed:

The sight wouldn't adjust down enough to get centered at 25 to 30 feet the distance I am shooting indoors with 5 pumps. It shoots about 1-1/2" high at the lowest setting. (fixed see my review on the gun)

What others should know:

When I first sighted it in I noticed that the bolt handle was angled to the rear. I have the 22 version as well so I thought the angle may have been changed on newer models. On closer inspection the bolt handle was cross threaded into the bolt. I thought I might have to send it back but it turned out that I was able to dress the threads and correctly install the handle.

5.0 5.0

5.0 5.0

Things I liked:

I've always liked my Crosman 177 pistol. I use it for plinking and getting rid of critters who like our garden as much as we do. Wasn't sure if the steel breech would make much difference and not sure it does. The new sight that comes with the kit is fantastic. Much better sight picture. Fully adjustable!

Things I would have changed:

Instructions aren't the best. I got a better set from Crosman. It tells you to loosen the barrel screw to lift the barrel up and out. My model doesn't have a barrel screw.

What others should know:

Kind of tricky re-installing the valve (don't remember the part name) but when it goes in it works great. I love the gun!

+ Load More

Got a question or answer?
Log in to participate

  • elcue from USA asked:

    What adapter do you use to mount a red dot sight on the 1377 with the steel breach. I have bought dovetail to weaver adapters to mount a sight and they do not fit the dovetail. I for some reason I just realized it states in the description. (Does not fit 3/8", 11mm, Weaver or Picatinny dovetails/bases) Duhh on me! What is used to mount a red dot or scope if desired?

    • Sterling from USA asked:

      does this breech assembly fit the older 1377 with the sliding breech cover?

      • Mark from USA answered:


    • No from Norway asked:

      im have an 2300 T co2 pistol, who im think to change wiyhn a stell brech. is it any apovement in that upgrade ?

      You may also like. ...see more

      Donny FL DonnyFL5.0 (33 reviews)
      Pre Order

      Out of Stock

      This item is past due. Check back for updates.

      DonnyFL Air Venturi Avenger Extender 1/2 x 20 Adapter

      Air Arms Cocking4.0 (25 reviews)
      Add to Cart

      Only 1 left in stock

      Air Arms Cocking Aid, Fits TX200

      Air Venturi Feinwerkbau5.0 (13 reviews)
      Pre Order

      Out of Stock

      Estimated in-stock date 01-31-23

      Air Venturi Feinwerkbau Piston Seal, Fits FWB 124 Air Rifle


      Buy with confidence

      Get FREE shipping on qualifying orders! Any order $150+ with a shipping address in the contiguous US will receive the option for free ground shipping on items sold & shipped by Pyramyd Air during checkout. Certain restrictions apply.

      Free shipping may not be combined with a coupon unless stated otherwise.

      View Shipping Info

      Text JOIN to 91256 and get $10 Off Your Next $50+ Order.

      * By providing your number above, you agree to receive recurring autodialed marketing text msgs (e.g. cart reminders) to the mobile number used at opt-in from Pyramyd Air on 91256. Reply with birthday MM/DD/YYYY to verify legal age of 18+ in order to receive texts. Consent is not a condition of purchase. Msg frequency may vary. Msg & data rates may apply. Reply HELP for help and STOP to cancel. See Terms and Conditions & Privacy Policy.