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View Full Version : WTK. barrel taper angle


Eyeguy
March 19, 2016, 17:38
I have an M1 where the forward handguard has more fore/aft play than desired. The current gas cylinder lock over times, and when returned to the 6:00 position and locking screw installed and tightened, pulls the gas cylinder forward enough to creat the fore/aft movement of the handguard. I would like to machine or hand ream the inside of the gas cylinder lock to allow it to time properly but can't find the spec on the angle of the taper here or that of the tapered seat, forward of the barrel threads. Does anyone here have that specification?

It's been suggested that I could unitize the handguard to the barrel ring with epoxy but would rather not if it can be avoided.

Thanks in advance.

tdb59
March 19, 2016, 18:19
What are you wanting to accomplish ? Play in the front handguard has no great effect on a standard grade rifle.

Reaming the gas cylinder lock gives it more positive contact to the cylinder when tightened to 6 o'clock, but does not alter play in the handguard.



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Eyeguy
March 19, 2016, 18:38
What are you wanting to accomplish ? Play in the front handguard has no great effect on a standard grade rifle.

Reaming the gas cylinder lock gives it more positive contact to the cylinder when tightened to 6 o'clock, but does not alter play in the handguard.



.

rdb59,

I'll bow to one with more knowledge of the M1 than I have and given this is my first that would almost everyone here. The reaming of the gas lock to allow it to time properly and to prevent it from pulling the gas cylinder forward was recommended by a fellow filer. My goal is to reduce the amount of fore/aft movement of the handguard that exists currently. Clearly doesn't affect performance but the damn thing rattles. My thought was that the 60 year old wood had just dried out and is doing had lost some volume.

tdb59
March 19, 2016, 18:55
rdb59,

I'll bow to one with more knowledge of the M1 than I have and given this is my first that would almost everyone here. The reaming of the gas lock to allow it to time properly and to prevent it from pulling the gas cylinder forward was recommended by a fellow filer. My goal is to reduce the amount of fore/aft movement of the handguard that exists currently. Clearly doesn't affect performance but the damn thing rattles. My thought was that the 60 year old wood had just dried out and is doing had lost some volume.

Gas cylinder position and handguard play are two different things.

Using AcraGlas and screws to attach the handguard to the middle band is the most secure way to stabilize the position of the handguard. There are several opinions on this, though.

The below link gives some clarity.



http://forums.thecmp.org/showthread.php?t=152514


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Eyeguy
March 19, 2016, 19:17
Gas cylinder position and handguard play are two different things.

Using AcraGlas and screws to attach the handguard to the middle band is the most secure way to stabilize the position of the handguard. There are several opinions on this, though.

The below link gives some clarity.



http://forums.thecmp.org/showthread.php?t=152514


.

Great info found in the link. The "play" in my handguard is in spec based on the info found in the link provided. Thanks:bow:

Orlando8
March 19, 2016, 20:42
I have acsess to dozens of gas locks and have also reamed them to time perfectly. I have never once seen any improvement in accuracy.
http://i47.photobucket.com/albums/f197/Garandlover/misc/Picture748.jpg (http://s47.photobucket.com/user/Garandlover/media/misc/Picture748.jpg.html)

I have however found accuracy to fall off if you overtighten a gas lock
If you just want to keep the handguard from rattling either peen the sides of the lower band to hold it in place of put o ring around barrel behind the gas cylinde.
There has to be some movement ,thats the way the Garand was designed otherwise the shots will string as barrel heats up