Modern Sporter builds Q&A

Has anyone installed a Luth MBA-1 stock on their Modern Sporter?

MBA-1-Black-600x800__43213.1543772685.jpg

I first noticed them on the Armalite M15 3 gun rigs and prefer solid stocks with zero flex / movement so this fits the bill.

I know it will be a little heavier than some but that weight will be in the rear of the rifle (not the front) which I am OK with.

My question is does the charging handle still function correctly (even with the cheek riser adjusted up) or does the stock impede it?
 

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Sniffer said:
Has anyone installed a Luth MBA-1 stock on their Modern Sporter?

View attachment 329573

I first noticed them on the Armalite M15 3 gun rigs and prefer solid stocks with zero flex / movement so this fits the bill.

I know it will be a little heavier than some but that weight will be in the rear of the rifle (not the front) which I am OK with.

My question is does the charging handle still function correctly (even with the cheek riser adjusted up) or does the stock impede it?
Click to expand...

I have one on a rifle. Real nice piece of kit. I originally had the non adjustable one and the cheek wield is just a bit low. No problems with the charging handle. And it’s nowhere near as heavy as you’d think. Way lighter than the PRS I have on another rifle.
 
Shorerider said:
I have one on a rifle. Real nice piece of kit. I originally had the non adjustable one and the cheek wield is just a bit low. No problems with the charging handle. And it’s nowhere near as heavy as you’d think. Way lighter than the PRS I have on another rifle.
Click to expand...

Thanks Shorerider, this will be the route I will be going then.......
 
Sniffer said:
Has anyone installed a Luth MBA-1 stock on their Modern Sporter?

View attachment 329573

I first noticed them on the Armalite M15 3 gun rigs and prefer solid stocks with zero flex / movement so this fits the bill.

I know it will be a little heavier than some but that weight will be in the rear of the rifle (not the front) which I am OK with.

My question is does the charging handle still function correctly (even with the cheek riser adjusted up) or does the stock impede it?
Click to expand...

I have one on my stag and I do not like it.
 
Seems cheaply made. Doesn't fit tight on the buffer tube. Cheek riser ends up being in the way of the charging handle although it doesn't seem to impede the function of the charging handle.
 
Does Anyone have any tips to get the rear takedown pin out? I hit it with a small hand torch and snapped the Alan key, not sure if there is a better tool than an Alan key ? ,

Also has anyone had luck installing a hiperfire competition Trigger by removing the pin, did it function correctly ?
 
I've bedded my upper and lower together. But now as the fit is snug the front takedown pin is tight. As my pin doesnt sit proud it's difficult to move the pin. Does anyone have info on which pins sit proud on the left side?
 
Trashblaster said:
I've bedded my upper and lower together. But now as the fit is snug the front takedown pin is tight. As my pin doesnt sit proud it's difficult to move the pin. Does anyone have info on which pins sit proud on the left side?
Click to expand...

Enhanced pins like battle arms will do you well and stick out
 
Got a quick question, maybe this has been answered in one of these threads already...

I read about the rear takedown pin not being a milspec part but being a proprietary part. Seems like folks were having ATRS modify the rear takedown hole so it would take a milspec pin.

Is this still the case? Is this mod worthwhile or can spare Sporter specific pins be purchased from ATRS?
 
Atrs was/is doing this modification at a cost to the buyer.
It’s definitely not necessary unless you have a trigger that otherwise may not fit.
I did mine, mostly for aesthetic reasons

You’d never need a spare rear pin as is a steel, non moving part, and is extremely unlikely that you’d ever have an issue with it
 
purplezuk said:
Atrs was/is doing this modification at a cost to the buyer.
It’s definitely not necessary unless you have a trigger that otherwise may not fit.
I did mine, mostly for aesthetic reasons

You’d never need a spare rear pin as is a steel, non moving part, and is extremely unlikely that you’d ever have an issue with it
Click to expand...

Thank you. I’ll see if I can find any photos showing the difference.
 
G.Mitchell said:
Got a quick question, maybe this has been answered in one of these threads already...

I read about the rear takedown pin not being a milspec part but being a proprietary part. Seems like folks were having ATRS modify the rear takedown hole so it would take a milspec pin.

Is this still the case? Is this mod worthwhile or can spare Sporter specific pins be purchased from ATRS?
Click to expand...

It's a fixed rear pin as it does not need to be removed to install the upper onto the lower, but the pin/hole size is milspec. The lower receivers do not come drilled for the detent/spring that standard ARs use to hold in the rear take-down pins though, so if you wanted to use a standard AR rear take-down pin you would need ATRS to drill a detent/spring hole for you. You can also use a KNS rear take-down pin, as they work without a detent/spring (they are internal to the pin).
 
Has anybody had issues inserting metal magazine? It seems my upper has a slight lip that protrudes into the magwell preventing 3 out of my 5 mags from being inserted. Of the 2 will go in only 1 will drop free.
 
XLNC said:
It's a fixed rear pin as it does not need to be removed to install the upper onto the lower, but the pin/hole size is milspec. The lower receivers do not come drilled for the detent/spring that standard ARs use to hold in the rear take-down pins though, so if you wanted to use a standard AR rear take-down pin you would need ATRS to drill a detent/spring hole for you. You can also use a KNS rear take-down pin, as they work without a detent/spring (they are internal to the pin).
Click to expand...

Thanks for the explanation. Guess I’ll leave it alone then. :)
 
I’m reading lots of complaints about mag compatibility. How common an issue is this?

I’d planned to use Gen 3 PMAGS, and the metal 10/30 mags S&J have/had. Maybe the Canadian made pistol mags too.

Is the mag issue something the end user can fix?
 
polkey said:
Has anybody had issues inserting metal magazine? It seems my upper has a slight lip that protrudes into the magwell preventing 3 out of my 5 mags from being inserted. Of the 2 will go in only 1 will drop free.
Click to expand...

contact atrs. the upper needs to be fixed.
 
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