Modern Sporter builds Q&A

I have a few quick questions for anyone in the know...

Is there any compatibility between MV and MS uppers and lowers? I know ATRS sells complete uppers for the MV...will these work with the MS lower? I'm sure this is pretty basic stuff and covered elsewhere but I haven't been able to track down a definitive answer.

I was also wondering if anyone had installed either a KAC or PRI handguard on an MS receiver and if any complications arose with compatibility?

Many thanks, SH
 
medic265 said:
I have a few quick questions for anyone in the know...

Is there any compatibility between MV and MS uppers and lowers? I know ATRS sells complete uppers for the MV...will these work with the MS lower? I'm sure this is pretty basic stuff and covered elsewhere but I haven't been able to track down a definitive answer.

I was also wondering if anyone had installed either a KAC or PRI handguard on an MS receiver and if any complications arose with compatibility?

Many thanks, SH
Click to expand...

MS and MV are not compatible.
 
SuperDeadlyAccountant said:
I've seen it recommended on any upper receiver regardless of how it's made. I'm more curious if ATRS does it (or would do it) so I don't have to buy my own lapping kit.
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I would think the chances of the barrel extension being not perfectly true would be more of a concern along with barrel misalignment in the extension.
Having had a glimpse at how ATRS actually machines their parts and knowing how close they keep their tolerances I doubt this is an issue. I own at least 1 version of every semi auto they build and the accuracy from all is stellar.
 
no-one special said:
I would think the chances of the barrel extension being not perfectly true would be more of a concern along with barrel misalignment in the extension.
Having had a glimpse at how ATRS actually machines their parts and knowing how close they keep their tolerances I doubt this is an issue. I own at least 1 version of every semi auto they build and the accuracy from all is stellar.
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Apparently you missed the the earlier MH threads.
 
I talked to ATRS and they recommend NOT lapping their receivers since they use the face that contacts the barrel as a reference point for the entire upper, meaning it's very accurate and lapping can actually make it worse.

From my reading, lapping is usually recommended on forged receivers and cheaply made billets.
 
Does anyone know if the Midwest Industries Combat Rail series will work with the MS receiver?

Is there anyway to determine compatibility of handguards without relying on anecdotal beta from guys who have tried installing a particular model? This is my first build of this type and I am hesitant to get into a situation where I need to do extensive metal filing/modifications to make a handguard fit well.

Thanks for your input.


http://https://www.brownells.com/rifle-parts/forend-amp-handguard-parts/handguards-amp-rails/ar-15-combat-handguards-free-float-m-lok-prod120014.aspx
 
medic265 said:
Thanks for that...could I ask where you got it? Import from Brownells?
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Got it from a site sponsor, but I think he’s gone out of business now..
Farm boy??? Maybe
I think CSC took over the KAC .

But Brownells has them as well
 
45C said:
Apparently you missed the the earlier MH threads.
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Not at all. I own an early model MH serial number under #50 and have had no functional issues at all and accuracy that I believe to be very good for a semi auto, as in .7 to .8 if I do my part. I know of another MH owner that shoots F Class with his and holds his own well against bolt guns.
 
PinaKaleada said:
Hey ATRS, wondering if you’d address problems like this fella’s charging handle coming out of the slot ever so slightly?

https://www.canadiangunnutz.com/for...ATRS-Modern-Sporter-Some-Initial-Observations

I’m about to buy a FA set but wondering if this is addressed, as I might see it as hick-up, Thanks!
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I've racked my ms 1000s of times and shot nearly 1000 rounds through and have not had one single issues or dragging or anything that could be associated with the charging handle catching. Dont run a rough piece of Chinese garbage and there wont be any problems.

The original poster hadn't even shot the rifle before he wrote that observation report. The relocated charging handle hole is a non issue and causes no issues.

It doesnt matter how slowly I let the charging handle go home it does not catch on anything inside. I've tried twisting and tourqing trying to make it grab and it just wont.

The reason the hole has to be there is because the upper is shorter overall than an ar15 and the rear lug is where the hole should be normally drilled. Atrs did extensive testing prior to release and wouldnt release a product that could have functional issues.

This was all disclosed in another thread as soon as they were aware of it
 
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greg olmstead said:
I've racked my ms 1000s of times and shot nearly 1000 rounds through and have not had one single issues or dragging or anything that could be associated with the charging handle catching. Dont run a rough piece of Chinese garbage and there wont be any problems.

The original poster hadn't even shot the rifle before he wrote that observation report. The relocated charging handle hole is a non issue and causes no issues.

It doesnt matter how slowly I let the charging handle go home it does not catch on anything inside. I've tried twisting and tourqing trying to make it grab and it just wont.

The reason the hole has to be there is because the upper is shorter overall than an ar15 and the rear lug is where the hole should be normally drilled. Atrs did extensive testing prior to release and wouldnt release a product that could have functional issues.

This was all disclosed in another thread as soon as they were aware of it
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Careful there. It's a valid concern and issue. Doesn't matter who made the charging handle, it will always have a tendency to catch on a corner of the insertion pocket because the corners are not radiused to prevent this from happening. The interaction of the bolt carrier, charging handle and upper dimensional tolerances and variances plays a big role in this.

Lots of guy's CH have been snagging, you're just lucky yours doesn't.
 
I am using a Brownells low mass BCG and a Raptor Radian and have had it catch a few times. I just make sure my stock is extended and I pull straight back and seems to be ok. It was partly to do with my stock pushing the handle upwards. But I do wish the notch in the upper was a little more to the rear as this would alleviate the concern. I just don't like how the charging handle ears can rech the notches when pulling all the way to the rear. If it becomes more of an issue and I find it catching again I'll be more vocal to ATRS, but so far it seems ok.
 
I just gave mine a try, because I never actually noticed the charging handle catching during regular use. I have to actually try to wiggle or twist it to make it catch, so it doesn't seem to be a problem for my regular type of use.

fwiw, Colt BCG and charging handle.
 
greg olmstead said:
I've racked my ms 1000s of times and shot nearly 1000 rounds through and have not had one single issues or dragging or anything that could be associated with the charging handle catching. Dont run a rough piece of Chinese garbage and there wont be any problems.

The original poster hadn't even shot the rifle before he wrote that observation report. The relocated charging handle hole is a non issue and causes no issues.

It doesnt matter how slowly I let the charging handle go home it does not catch on anything inside. I've tried twisting and tourqing trying to make it grab and it just wont.

The reason the hole has to be there is because the upper is shorter overall than an ar15 and the rear lug is where the hole should be normally drilled. Atrs did extensive testing prior to release and wouldnt release a product that could have functional issues.

This was all disclosed in another thread as soon as they were aware of it
Click to expand...

Oh yes I know your type of firearms owner, you’re the kind who likes Keltec SU16 as long as yours doesn’t have a cracked rear receiver yet, or a CZ858 that hasn’t had a gremlin so far, or maybe an SLR that requires more custom work, to work.

See, the rest of us thinks that firearms should be flawless to the extent that unless it’s breakage due to high round count, things should be designed thoughtfully and work flawlessly. None of us are coming from the angle of dissing the product. I assure you everyone wants this to be the 1 answer to the AR15 restriction, but it first has to work and not get hung up by out derailed charging handles.
 
PinaKaleada said:
Oh yes I know your type of firearms owner, you’re the kind who likes Keltec SU16 as long as yours doesn’t have a cracked rear receiver yet, or a CZ858 that hasn’t had a gremlin so far, or maybe an SLR that requires more custom work, to work.

See, the rest of us thinks that firearms should be flawless to the extent that unless it’s breakage due to high round count, things should be designed thoughtfully and work flawlessly. None of us are coming from the angle of dissing the product. I assure you everyone wants this to be the 1 answer to the AR15 restriction, but it first has to work and not get hung up by out derailed charging handles.
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Except you couldn't be more wrong. I'd never own a piece of crap like a su16. I've never touched an 858 and I wouldnt touch an slr.

If YOU are having problems with YOUR Ms maybe it something that YOU are doing wrong. Every think of that there bud? I haven't had a single problem with mine. I dont know what you are doing to yours or what kind of cheap Chinese garbage you put in it. But dont assume I'm some clown that doesnt know anything about guns. Just makes you look like an ignorant fool. You probably dont even have a modern sporter and are just stirring the pot. You asked a question about someone's OBSERVATION. and I gave you a real first hand experience with what I have experienced with my rifle.
 
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