View Full Version : Bore Sighting a M1A

October 9, 2009, 12:07 AM
How do you bore sight the M1A with the long flash supressor? Are there extensions for the kits such as the Leupold that fit in the barrel?

I appreciate your help.


October 9, 2009, 12:17 AM
Bore sighting this?


No rifle called an M1A1.

Springfield makes an M1A, however. which is a commercial derivative of the M14 class of rifles.

Anyways: bore sighting.

There are little laser adapters that are shaped like cartridges. You can get one in .308.


I've had 2 M14 rifles, though, and I've sighted them in by strapping the scope to the mount and going to the range. If it's visibly tweaked off-center then adjust the mounts as well as you can. Once it is visibly aligned, start at 25 yards and put a 3 or 5 shot group downrange.

If POI isn't equal to POA, measure the distance and multiply that distance by 4. This gives you your Minutes of Angle that you're off. Adjust the cross-hairs accordingly using the 1/4 MOA adjustments on your scope. Do another group of 3 or 5 to confirm the adjustments are correct.

Put the paper out at 100 yards (or 200, or wherever you want it zeroed). Repeat the process one more time: Fire a group, measure, adjust scope after translating the error distance into minutes of angle, and confirm the adjustment was correct.

Simple. Done in less than a 20rd box of rifle ammo.

ETA: Okay, there is a rifle called an M1A1: Actually, there are two: The M1A1 .30 caliber carbine and the M1A1 Thompson submachine gun. But, you probably weren't talking about those.

October 9, 2009, 12:28 AM
My Bad...I corrected my error...thank you for your reply...you have answered my question.

Thanks Bimmer

October 9, 2009, 01:00 AM
The M1A1 is a specific variant of the M1 carbine, so technically it does exist.


October 14, 2009, 03:47 PM
I've never seen a bore sighter set up with a long enough spud for an M1A but I would not be surprised if someone doesn't offer one for one of the big name set ups. It's so easy just to set up a BIG target at 25 yards and fire two rounds and make gross adjustments and move on out from there.


October 14, 2009, 06:52 PM
Simple solution is a USGI (or something similar) 90* bore mirror. Thats what I use on all my rifles that you cant pull the bolt and look directly down the barrel.

Just set the rifle up like a bolt gun, pop the bore mirror in the chamber, and sight down the bore.

October 15, 2009, 11:41 AM
The bore mirror sounds good. Where would I find one of those animals?


October 15, 2009, 12:48 PM
A quick search turned this up. I just happens to be the one I have. Mine wasnt an antique when I got it, and it didnt cost $15. :)


October 15, 2009, 12:55 PM
Thanks. I'll be on the lookout for one.