Steel breech on Crosman 1377, can you mount factory sights?

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Can you mount the factory sight back on a steel breach kit for a 1377 or are they only for scopes?
 
i'm not sure, i don't think you can, but i just ordered one along with a flat top piston kit for my 1377 and will let you know. i should have it within the next 5 days i hope.
 
RJ machine for example makes a steel breech that will accept the factory sights as well as a scope.
By the way, the flat top piston/valve kit in the 1377 is a must.
 
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RJ machine for example makes a steel breech that will accept the factory sights as well as a scope.
By the way, the flat top piston kit in the 1377 is a must.

i know it reduces the amount of pumps needed to get the same pressure as 10 pumps does on the normal piston, but will it let you get more pressure?


also do you know if there is a pressure relief valve on the gun?
 
RJ machine for example makes a steel breech that will accept the factory sights as well as a scope.
By the way, the flat top piston kit in the 1377 is a must.

THAT's who it was, I couldn't find the sight again so I ended up ordering the Crosman breech with the upgraded piston kit and seal kit for spares. I think the Crosman has a dovetail for the LPA sight.

I don't want to spend another $50 on a sight so I will see if I can mill it or rig up a simple sight myself. The gun cost me $80, I just spent over $115 on the upgrades and am about to order a set of RB Grips in Cocobolo for another $80 or so. :eek:
 
i know it reduces the amount of pumps needed to get the same pressure as 10 pumps does on the normal piston, but will it let you get more pressure?


also do you know if there is a pressure relief valve on the gun?

Yes you can get more pressure as well as less pumps for same pressure.

The original valve on canadian versions has a "pressure relief" built in. The flat top valve upgrade does not.
 
THAT's who it was, I couldn't find the sight again so I ended up ordering the Crosman breech with the upgraded piston kit and seal kit for spares. I think the Crosman has a dovetail for the LPA sight.

I don't want to spend another $50 on a sight so I will see if I can mill it or rig up a simple sight myself. The gun cost me $80, I just spent over $115 on the upgrades and am about to order a set of RB Grips in Cocobolo for another $80 or so. :eek:

who did you order from? i just got my order from scopes and ammo and i ordered saturday :) amazing place it is. then again it's about 2 hours away.

i will post some pictures of the new gun with it's steel breech. makes it feel really nice so far.

Yes you can get more pressure as well as less pumps for same pressure.

The original valve on canadian versions has a "pressure relief" built in. The flat top valve upgrade does not.

nice :)


EDIT: WOW! in the testing phase for the piston length and at 6 pumps i can pretty much flatten a standard wad cutter.
 
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all back together, will sight in the crappy scope later on.

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it was well worth adding the flat top and breech, a million times better.
 
Looks like it just has the dovetail for the LPA. Is it solid at the back or drilled through?

Nice looking gun, I can post pics when I get mine all together, should have some sweet grips in a few weeks.

I chrony'd mine as is and get an average of 410 FPS with 10 pumps and 7.5gr "hunting" pellets. I'll chrony it once the mods are complete.

PS, where'd you get the brass trigger?
 
there is a hole drilled in the back since the bolt ships in 2 pieces. you screw on the bolt handle once the bolt is in. then there is a little domes cap that you put in the hole and put the screw through.

the brass trigger came with mine from the factory, the old bolt was as well. i was going to try and reuse it, but i couldn't get it apart. actually i never tried that much as i didn't want to scratch it up trying to unscrew it.
 
Mine came today. New flat-top piston and steel breech installed, haven't played around with it at all yet, I may chrony it tomorrow.

I think I will just order an LPA rear sight from DL Airgun.
 
Here is my simple rear sight made from the elevation insert of the factory sight. Not even close to fancy or very adjustable, but I hope it does the job. I should shoot it and chrony it later today.

fnbexs.jpg
 
Now I just need my sweet grips.

PS, my homemade sight works fine.
 
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Around 410.

Does anyone know of the spring required to dump all the air out of the piston with these mods? Mine holds a bit of air as I have heard it would.
 
Around 410.

Does anyone know of the spring required to dump all the air out of the piston with these mods? Mine holds a bit of air as I have heard it would.

how many pumps? i can do about 9 and it will unload all the air. more then 9 and it holds some.

there are 2 ways to go about it from what i've read and have been told. make the hammer spring stronger or make the valve spring weaker. if you make the hammer spring harder it's also harder to ####. but with the weaker valve spring, you need to #### the hammer first as the hammer holds open the valve.
 
Here is my simple rear sight made from the elevation insert of the factory sight. Not even close to fancy or very adjustable, but I hope it does the job. I should shoot it and chrony it later today.

fnbexs.jpg

I just did this to my Steel breeched 2240.It works like a charm.You are very clever to figure that sight mod out..Wish I knew this trick years ago..Would have saved me the hassle of using those terrible red dot sights..Red dots look really ugly on these guns as well..Thanks a million..
 
Guys i found this steel breech at D&L but can someone walk me through this . What is a piston kit , where do i get that ? Spawn-Inc mentioned making the hammer spring stronger or the valve spring weaker . Is that something i'll have to do , and if i do , how ? Below is my HW-45 that i changed the barrel from .22 to .20 to get a little flatter trajectory , and i did . RB grips and a Leupold/Gilmore red dot . Maccari spring tar to tame it and that works also . Tons of enemy rabbits and partride have paid the price . Below that is an old 2240 that is long gone . The pic was taken before i bottomlined it with a 3.5 ounce co2 tank out the back of the grip . The muzzle brake is fake . That was with an old Rino breech . Good gun when it was shooting but i got fed up trying to stop it from leaking .

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