Modern Sporter - Build Discussions

Hey guys, since the MS isn't a "AR15" will a Magpul PRS stock fit/sync up perfectly with the MS lower? Like it does with a AR15? Or will it be too fat/skinny. tall/short and not line up correctly?

 
If any of you guys are looking for a rifle case, cabelas has the rangemaxx long range rifle case on for $59 right now. Very well made and comes in coyote brown. Worth the money for sure
 
Z06corvette said:
The cutoff for run #1 was 223 I believe. I'm a couple past that and waiting for the first batch of run #2.
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I'm less than 30 past 223. I was expecting an August ship date but that ship has sailed. No big deal as I won't have time for my build before late September anyway.

BUT I'M STILL REALLY STOKED ABOUT THIS!!!!!!!!!
 
Has anyone used a JP silent captured spring buffer in one of these? I’m having issues with my setup, thinking about ordering a Lantac e-bcg and JP buffer kit
 
jmb9046 said:
Has anyone used a JP silent captured spring buffer in one of these? I’m having issues with my setup, thinking about ordering a Lantac e-bcg and JP buffer kit
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I’ve built lots with the JP SCS and never had a problem.

Can you post a build list and what is exactly wrong with your MS?
 
I built it with the following parts
Faxon 18.6” Gunner .223 Wylde rifle length gas
Faxon .625” low pro gas block
Faxon G2 15” handguard
Ergo enhanced lpk
Bcm pnt trigger assembly
Used the following parts from a brand new m&p:
Buffer tube
Spring
Buffer
Bcg

The issue I was having is the bolt seems excessively tight in the carrier. Every couple round I would get a strange “twang” sound in the buffer, and there would be a round jammed under the bolt and gouged along the casing. I dumped a rediculous amount of oil into it and got the last 20 off without a hiccup. Tried Winchester 55gr bulk and hornady black 62gr. Ejection is consistently around the 3-4 position. I ran it wet to begin with, and have cleaned it, but when inserting the bolt into the carrier there still feels to be excessive force required to move it, almost like it snaps into place.
 
jmb9046 said:
I built it with the following parts
Faxon 18.6” Gunner .223 Wylde rifle length gas
Faxon .625” low pro gas block
Faxon G2 15” handguard
Ergo enhanced lpk
Bcm pnt trigger assembly
Used the following parts from a brand new m&p:
Buffer tube
Spring
Buffer
Bcg

The issue I was having is the bolt seems excessively tight in the carrier. Every couple round I would get a strange “twang” sound in the buffer, and there would be a round jammed under the bolt and gouged along the casing. I dumped a rediculous amount of oil into it and got the last 20 off without a hiccup. Tried Winchester 55gr bulk and hornady black 62gr. Ejection is consistently around the 3-4 position. I ran it wet to begin with, and have cleaned it, but when inserting the bolt into the carrier there still feels to be excessive force required to move it, almost like it snaps into place.
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You need to isolate the problem. If you can borrow another, try changing out the BCG first and see if that works. What weight Buffer are you running?
 
I won’t have access to another bcg for a week or two, and was hoping to take advantage of a sale this weekend lol I’m not sure of the buffer weight, came out of a S&W m&p 15 so carbine weight I suppose? I’m relatively new to this side of things that go pew
 
There’s extractor marks on the rim, and there’s 2 small scratches at the neck about 3/16” apart in line with the extractor marks
And it’s a FA upper
 
jmb9046 said:
There’s extractor marks on the rim, and there’s 2 small scratches at the neck about 3/16” apart in line with the extractor marks
And it’s a FA upper
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My guess is it’s probably overgassed.

I would try a heavier buffer first. I would check to see what you had, maybe try an H2.
 
Which third party trigger do people recommend? I'm looking at either a Geissele Super 3 gun or some sort of Timney trigger. Cheers.
 
I really like the super 3 gun for that kind of stuff, in close, shooting quick, etc but I think the SSA/SSA-E suits the 18.6+ barreled rifle more.
 
Brownells has the Geissele G2S -E which is identical to the ssa-e just doesn’t have the laser markings on it. It’s a brownells exclusive and I got mine for like $139 on sale.
 
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