Modern Sporter builds Q&A

scourge18a said:
I feel the exact opposite.
When I brought up my issues with the other manufacturer I was completely ignored. ATRS has been very upfront with any known issues and offered solutions. Both are proprietary, not ARs.
I am much happier with the communication, fit and finish, design and warranty with my MS.
I am sure if you aren't happy ATRS will look after you. Or I am sure that someone will pay you more than you paid for it if you wanted to get rid of it and wait for another SLR. SLRs being available in Calgary before fulfilling orders elsewhere and a complete lack of communication to those dealers when they reportedly had to pay upfront are reason enough for me to never touch one again.
Everyone makes mistakes, it just depends on how they deal with them. I'd say there is a clear difference in character there.
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Receiver have already been sold. Poor fella
 
alberta tactical rifle said:
Several LARGE US manufacturers have been doing exactly the same thing as we are regarding an enlarged port, and for many years now and this is the first we have ever heard of what we believe is a non issue.
In the thousands of rounds fired in the prototypes and T&E guns we have not seen any issue as you describe. The only "issue" with the enlarged port, which really is non issue is that there is not as much material for the port door catch to engage in, so fitment of the door needs a little more work.
We enlarged to port opening due to the number of guys wanting the ability to do big bore builds.
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Just to be sure, respectfully, you do understand that I am talking about the lack of sliding surface at the port side of the upper, for the top sliding rail of the bolt carrier, correct?

This is the first time I see (or hear of) an upper with the sliding surface for the carrier at the top of the port completely removed for the lenght of the port.

Given that the F/A uppers have not started production we can shrink the port back to standard AR size. So if this is a huge concern for you I would recommend purchasing the F/A upper if you intent to purchase a Modern Sporter.
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And for those who already have the slickside upper in hand? Those who do not want the forward assist nor the enlarged port?
 
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QuickDraw16 said:
Can spring and guide rod be separated from the back plate or is the spring guide fixed in place?

I can’t see any reason why you wouldn’t be able to have that rear plate machined to fit in the buffer tube (like a normal bolt carrier) and have a tab welded an appropriate distance forward on the guide rod.

This assumes that the tab would then fit in the upper.

I can try and sketch out what mean if it’s not clear.
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The tab would fit in the upper, that’s how it’s designed. The upper is just short is all. I might just cut the horizontal mounting plate and find a way to retain the BCG in the upper with .175” of the plate cut out. The spring will want to come back so the plate will fly out during disassembly if not retained in the upper somehow.

The whole mechanism won’t crater if it’s .175” shorter, the actual moving part has lots of room still for those that are thinking of modifying the BCG assembly. The spring may need shortening since it’ll be compressed more then normal.
 
Kratos said:
The tab would fit in the upper, that’s how it’s designed. The upper is just short is all. I might just cut the horizontal mounting plate and find a way to retain the BCG in the upper with .175” of the plate cut out. The spring will want to come back so the plate will fly out during disassembly if not retained in the upper somehow.

The whole mechanism won’t crater if it’s .175” shorter, the actual moving part has lots of room still for those that are thinking of modifying the BCG assembly. The spring may need shortening since it’ll be compressed more then normal.
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So basically we need to shorten and re weld the cmmg assembly .175. Can’t be more than an hour labour at a machine shop.
 
robab said:
So basically we need to shorten and re weld the cmmg assembly .175. Can’t be more than an hour labour at a machine shop.
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Yeah, and then testing the spring but that’s just range time. I might try it myself and ATRS might have to weld it back together if my idea doesn’t work lol.
 
jiffx2781 said:
There's no point in having a beveled corner because no matter what you do with the rear takedown pin it is never going to pivot open anyways because the rear of the bcg sticks out of the back of the upper.

These work exactly like the Modern Varmint where you have to push the front pin out and slide the upper forward and then lift it off to separate.

There's technically no point in having a removable rear pin.

Well maybe there is a point now that we realize some triggers interfere with the rear lug during assembly/takedown but once again it's never going to pivot open.
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I was just going to ask about this bc I couldn’t separate my newly assembled MS without removing the front pin and sliding the upper forward. I noticed the the BCG was catching on the lower receiver extension female threads kinda (does that makes sense haha), stopping me from pivoting the upper...that’s normal for the MS, MH and MV?
 
This is what i have happening as well.
One upper seems not that bad. The other is very tight. MFT 10R Pistol is the only one that goes in and drops free.
The Pmags go in but need pulled out. and the 10R pistol C products will go in and is hard to extract and the other upper i deeply regretted
putting it in 10 min of swearing issued. I have been 2 busy to contact them.
They are great and I have faith we can get it resolved.
 
hardyshooter said:
Anyone having mag seating issues? Both metal mags and pmags won't work in either upper. Have one lower currently. It seems the upper sits rear ward on the lower, creating a lip inside the magwell that prevents the mags from seating. The upper and lower fit snug with very little movement so this seems strange..
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This is what i have happening as well.
One upper seems not that bad. The other is very tight. MFT 10R Pistol is the only one that goes in and drops free.
The Pmags go in but need pulled out. and the 10R pistol C products will go in and is hard to extract and the other upper i deeply regretted
putting it in 10 min of swearing issued. I have been 2 busy to contact them.
They are great and I have faith we can get it resolved
 
Knuckles87 said:
This is what i have happening as well.
One upper seems not that bad. The other is very tight. MFT 10R Pistol is the only one that goes in and drops free.
The Pmags go in but need pulled out. and the 10R pistol C products will go in and is hard to extract and the other upper i deeply regretted
putting it in 10 min of swearing issued. I have been 2 busy to contact them.
They are great and I have faith we can get it resolved
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P Mags can act that way in many lowers, being as plastic is hard to hold dimensions on. A little sanding will solve this assuming they seat ok. If they don't seat properly look at the mag catch as possibly being the culprit. I suspect the latter with the comment on the metal mag.
 
Butzy357 said:
I was just going to ask about this bc I couldn’t separate my newly assembled MS without removing the front pin and sliding the upper forward. I noticed the the BCG was catching on the lower receiver extension female threads kinda (does that makes sense haha), stopping me from pivoting the upper...that’s normal for the MS, MH and MV?
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NONE of the Modern series rifle were ever designed to pivot. These are NOT ARs!! You have to push the front TD pin out in order to slide the upper forward slightly to seperate the upper from the lower.
 
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