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  #1  
Old 02-17-2019, 01:34 PM
Doubs43 Doubs43 is offline
 
Join Date: Oct 2011
Location: Byron, GA
Posts: 847
Default M1A Scope Mount Experience

My free 4th Generation aluminum scope mount for my new M1A Loaded arrived last Monday. I mounted it, following the instructions exactly. Then I put a Vortex Viper 6.5 ~ 20X44 scope on top.

My cartridges are LC cases, 42.0 grains of IMR-4895 and 150 grain Hornady FMJBT bullets at an OAL of 2.800". (About 2650 fps according to my manual) The rifle was already sighted in at 100 yards for that cartridge using the iron sights. I aligned the iron sights on the target and then adjusted the scope to match.

First shot was right. Adjusted and next shot was close to POA. A few more shots and I moved out to 200 yards. Then shots began to go all over. The front mount screw, even tightened with a HUGE screwdriver as required, had loosened.

Back home I cleaned the receiver and screw threads with naphtha and applied the equivalent of Blue Loctite. Then the screw was secured once more with the big screwdriver.

Yesterday I shot it again and this time it seems like it will hold. My load that I also use in my Garands, looks like a 2 MOA load in the M1A. My next loads will be with 168 grain bullets which should do better.

Anyone else have this experience with their M1A mount?
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  #2  
Old 02-17-2019, 01:39 PM
nf1e nf1e is offline
 
Join Date: Apr 2012
Location: Connecticut
Posts: 2,057
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Only mounts, that I have used, that do not need loctite are Bassett's. Then, if you clean and degrease the bolt and receiver hole, they seem to hold very well when tightened to their torque spec using the Bassett tool.

This one is on a Fulton receiver.

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Last edited by nf1e; 02-17-2019 at 01:41 PM.
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  #3  
Old 02-18-2019, 10:07 AM
lairdstew lairdstew is offline
 
Join Date: Nov 2011
Location: Ohio
Posts: 219
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+1 on the Bassett. I have a 4th gen Springfield that I was trying to mount on my Springfield M1A and it was way offset to the left. I tried and tried and even took to filing the mount but it was not in line at all.
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  #4  
Old 02-18-2019, 10:32 AM
Doubs43 Doubs43 is offline
 
Join Date: Oct 2011
Location: Byron, GA
Posts: 847
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Thanks for the endorsement of the Bassett mount. If my SA mount doesn't work out, I'll give the Bassett serious consideration. It is a nice looking mount.
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  #5  
Old 02-19-2019, 09:30 PM
iprfr69 iprfr69 is offline
 
Join Date: Dec 2018
Location: Washington State
Posts: 18
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I bought the A.R.M.S Mount for my M1A and had issues with it holding a zero. Next I went with Smith, Same issues. I then went with the Springfield Mount and it is a tack driver. I shoot USGI Match only and it loves it, I have a Leupold MK4 on it.
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  #6  
Old 02-20-2019, 07:35 AM
nf1e nf1e is offline
 
Join Date: Apr 2012
Location: Connecticut
Posts: 2,057
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Another type Bassett. This one is their low Weaver style mount.

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  #7  
Old 02-21-2019, 03:55 PM
Orlando Orlando is offline
 
Join Date: Oct 2009
Location: Ohio
Posts: 10,244
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I use the cheap aluminum Sadlak mount. No Loctite, never has loosened up yet after many, many rounds
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