M1A Sage EBR: Accurizing Idea

[RCGunDude]

what up gun wizards and gurus.... just completed my EBR chassis swap. fixed the mag by removing the mag release, then drilled and tapped a 6-32 hole for a hex head set screw which I silver solder'd in place.

I don't love how the receiver design of the M1A relies on the trigger housing clamping it down. I was thinking about drilling / tapping a 10-32 hole and adding a set screw w nut which clamps against the sling swivel attachment on the ebr chassis...... pic attached.

would not apply any torque, just snug the hex bolt finger tight against the sling attachment then snug the nut down finger tight on the other side

thinking that would hold the rear of the receiver firmly w/ zero movement in the horizontal plane as well as lock it down in the vertical plane for zero movement.

would this addition improve "repeatability" by adding another component keeping the receiver locked down??

[Hateca]

I would not put anything behind this receiver. It won’t help like you think and any recoil against that bolt will put that receiver in danger.

Getting a M1A to be accurate in a wood stock takes lots of work and money. Sorry to say I had a sage stock for a time and I didn’t have it long, heavy as hell, didn’t help accuracy one bit.

It was created to fill a military need for a short time simply for durability over wood or synthetic stocks. I wouldn’t waste time or money trying to make a M1A more accurate sitting in a sage stock.

[ar15barrels]

No.
The receiver is fixed front-back by the lugs.
Your new screw would be UNSEATING that bedding, causing the receiver to float forwards which would make the bedding less consistent than before you added the screw.

[tigerpan]

Troy chassis will make M1a more accurate, but is way more heavy than EBR. The. It make more like ar10

[RCGunDude]

Ok good tips! won't add any additional support to the rear.

not looking to make it super accurate, I did the Sadlak BS stuff like guide rod & TiN piston & shimmed the gas block rather than crush washer. I just love the styling and love the M1A.

dont mind the weight. totally realize it's gonna be a bench rifle, wanna make as terminator as possible. ha! probably gonna add a light asap.

thanks for the quick advice!

[saki302]

The AR-type stock conversion with the EBR chassis makes it substantially lighter- the collapsing metal stock weighs a ton.

It should shoot the same as a Troy- in military testing the EBR chassis increased accuracy- the receiver is clamped in tightly and in a repeatable position. From what I have read, the Troy weighs more than the EBR with the AR stock adapter (which is essentially the same thing- besides the EBR requires an additional scope mount and retains usable iron sights).

The EBR does two things- clamps the receiver nice and tight, and does the equivalent of unitizing the gas system.
If the M1A won't shoot still, try messing with the gas pistons. It sounds strange, but the gas pistons have a measurable effect on accuracy depending on loads.

I've fired one with the collapsing stock, I don't know what it was, but the cheek piece felt like someone snapped a rubber band against my face with every shot. Some kind of weird vibrational harmonics maybe?

[RCGunDude]

The AR-type stock conversion with the EBR chassis makes it substantially lighter- the collapsing metal stock weighs a ton.

It should shoot the same as a Troy- in military testing the EBR chassis increased accuracy- the receiver is clamped in tightly and in a repeatable position. From what I have read, the Troy weighs more than the EBR with the AR stock adapter (which is essentially the same thing- besides the EBR requires an additional scope mount and retains usable iron sights).

The EBR does two things- clamps the receiver nice and tight, and does the equivalent of unitizing the gas system.
If the M1A won't shoot still, try messing with the gas pistons. It sounds strange, but the gas pistons have a measurable effect on accuracy depending on loads.

I've fired one with the collapsing stock, I don't know what it was, but the cheek piece felt like someone snapped a rubber band against my face with every shot. Some kind of weird vibrational harmonics maybe?

maybe the way your ear protection was interacting with the cheek riser or were you running foamies?

personally I love the metal collapsible MOD 0 rear set-up, just gun pornography for this build I seriously wouldn't care if it weighed 30lbs. ha

could barely even shoot my 1st range day a couple days ago everybody wanted to see it and snap pics. Range master even asked if he could shoot it after a while of eye'n it