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M1A mount/ scope issue

2K views 7 replies 7 participants last post by  tonyben 
#1 ·
Hey everybody, Bravo 16 here from Texas. I am new to the big bore world. I recently retired from an entity that allowed only double action pistols and .223 M-4 platforms. So the first thing I did was secure a 1911 and an M1A with plans to mount a scope. Based on reviews, I bought the SA factory scope mount and a Nikon M-308. I got them mounted and after I carefully broke the barrel in, I shot 3 rounds from 100 meters and was eight feet off the paper. I did not have enough windage adjustment in the turrets to even get it on paper. The iron sight shoot 2" groups at 100 meters, so something in the mounting is aflaw. I realize that an nth of mis adjustment to the mount or optic can exacerbate the problem eight feet worth at 100 m, but I cannot find the glitch. Micrometer readings are right, everything is tight, boreshighting is on. Any ideas?
 
#2 · (Edited)
so something in the mounting is aflaw.
That would certainly be my assumption and most often whenever anytime something is afoul with my setup it usually always ends up being a loose scope mount.

I too have very limited experience with the M1A but it is my understanding that the factory Springfield scope mounts may not be nearly as well built as the Basset, Sadlak or the A.R.M. #18 mounts. I personally use a Basset mount and am more than happy with it.

I am currently going through the same issue with a Colt M4 that I recently purchased, dang thing shoots very good with the open sights but the hits are all over the place with the scope.

Double check and good luck!
 
#3 ·
The problem is most likely that the receiver isn't made to USGI specs. but the mount is.

I suggest that you go to the Sadlak web site, you will find out exactly why you are having this problem, and how to fix it.

The folks at Sadlak are real helpful, give them a call.

Rich
 
#5 ·
He has a springfield armory mount though, at least I think that's what he means by SA factory mount.

Anyways mr Bravo what you want to do is take off your scope but leave the mount on, then pull a string from your front sight to rear peep sight to make a straight line down the bore. It should be obvious if your mount is pointing the wrong way. Oftentimes the stripper clip guide isn't 100% in the right place so the mount will sit funny when tightened. Or the receiver hole is too far forward or back, or the slot in the receiver isn't 100% correct.
 
#6 ·
Welcome to the Forum B16
Do you plan the leave the Optics mounted most of the time ?
If so, you you want the option of using your Iron Sights too ?
OR....
Are you planning to mount, dismount and remount the Optics over and over ?
This will dictate which mount is better suited to your needs
If it were me, I'd sent the SAI Mount back and ask for a full refund, as there are much better Scope Mounts than the Factory one
Just my $0.02
 
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#7 ·
Rodgadat to all, and thank you. Yes, the plan is to leave the scope on. That is why I chose the Springfield Armory mousnt, so I can use the iron sights if the optic goes down. Sadlak has a wonderful rep in my community. LaRue Tactical sells a quick detach mount, although not cheap that they 100% guarantee will return to zero on remounting. If this does not work out, I will follow another course. Thanks to all.
 
#8 ·
If this is the case, I recommend returning the SAI mount and getting the Sadlak steel or Airborne mount. There are a few members who have had success with the SAI Gen 4 mounts, though. The earlier versions have a reputation for being less than reliable.

Tony.
 
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