indian mods-crosman 1377c pistol-south africa

[airvolver]

hi guys...just another indian, but from south africa. this is a wonderful forum!

i own a crosman 1377c multi-stroke pnuematic pistol. i have done extensive mods to it thus far, lots of custom parts fitted into and onto it. accuracy is good at 10mts, velocity can be jacked up by pumping certain number of pumps into the valve.

the piston has been modified to a FLAT TOP PISTON and the Valve is heavily modded, ID bored out for more internal volume, exhaust port angle relieved to about 45 degrees to help with fast flow, heavy valve spring changed for a lighter one, hammer spring changed for a heavier one to dump all the air in the valve at higher pressures.

factory stock condition-maximum 10 pumps only- approximately 565-600fps.
in current modified format-25 pumps maximum it is tuned for-10.49gr Gamo TS-10 pellets launched at 747fps...

still playing with accuracy and tweaks to squeeze out more fps, but to come soon is a longer barrel...at the moment it is a 10.25" barrel...i will be dropping in a 17" barrel to get the best out of the valve power. then finally, a scope! i have an LPA MIM rear sight at the moment.

some pics for you guys...

[snIPer]

Thanks a lot for the detailed pics -quite a lot of tweaks there.
/s/

[farhan.lateefi]

Hi Airvolver,

good work.. you seems to have in depth knowledge about the mechanism. keep sharing ..

many thanks
farhan

[airvolver]

thanks snIPer !

lots of research, preparation and patience! parts had to be imported to south africa, i just ordered them online and they arrived in my post box here in south africa.

South African Rand To Dollar exchange rate was bad, so it did work out costly. that is why the longer barrel is not on it yet, but in the next few months, i should order the longer barrel.

for anyone truly interested in modifying their crosman 1377c .177c pump air pistols, it will be my pleasure to assist them in any way possible, i have lots of diagrams and files to show how to go about it. careful planning and attention to detail is the best recipe for a solid pistol setup.
the crosman 1377c can be modified for power and the trigger tune can be done without heavy costs on a local level without importing parts. i did the best i could before getting in parts for the pistol.

now, with 8 pumps, my pistol will shoot a 10.49gr Gamo hunting pellet, RIGHT THROUGH a plastic coke bottle filled with water...at 5 meters! that is serious power from a 10 inch .177 barrel, shooting a heavy pellet grainage.

i recently installed the LPA MIM rear sight on the custom steel breech. i am getting under 1 inch groups from GAMO PRO HUNTER &>*&GR pellets at 8 pumps at 7 meters. when i put a scope on, i will be testing for longer range accuracy.

a silencer is now highly necessary, as i am getting PCP power out of my valve between 20-25 pumps. massive power, so loud, that it literally goes BOOM...lol.

-- Thu Dec 03, 2009 3:37 pm --

thanks farhan.

i used to apprentice as a gunsmith about 8 years ago, although i dont have machine experience, i have substantial experience with hand filing and parts making by freehand. it was the type of teaching my master gunsmith wanted to eductae me in. so everything you see in the photo, was hand filed and honed to fit perfectly, even the shortening and cutting of the hard stainless steel screws! the only thing done by machine (a lathe), was the valve porting and the boring out of the valve exhaust port ID.

my fingers are in a bad way now and still recovering, but it just adds to the romance i have with this air pistol.

[fantumfan2003]

Awsome stuff.

M.