Modern Sporter - Build Discussions

McWilly said:
I have the same problem with a milspec cover rod. Problem is i've installed it as deep as it goes and i am not interested in bringing a $500 reciever that close to a grinder. How in the name of Zeus' butthole do you get the rod out without destroying everything?

Also, my BCG doesn't pop the cover open when I cycle it (BAD enhanced M16 BCG with a milspec cover).
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I had to do that with my SLR. Use small needlenose pliers to get a purchase of the rod just rear of the cover spring. Just slowly work the rod forward, compressing the spring a mm at a time until enough of the end is exposed for you to grab with pliers.

As for the BCG not popping the cover, as discussed earlier you can remedy this by putting a bead of epoxy either on the BC or on the inside surface of the cover. In a regular AR, the cover is forced open when the widest part of the bolt carrier travels rearward and strikes the spring housing at the top of the cover. With the MS the gap is a little wider so some BCGs don't make contact with the cover. Build up either surface with a bead of epoxy or JB and you should be good to go.
 
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DILLIGAF said:
For the price we paid for these sets, backyard gunsmithing isn't something that should happen.
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Most bolt carrier groups do not create this issue. There are a handful of lightweight BCGs which are not mil-spec in proportion, in order to reduce weight. You can't expect any manufacturer to anticipate every deviation from milspec. I don't know why it bears repeating, but these are not ARs. These are custom designed very specifically to not be identical to ARs - including adding the feature of a slightly larger ejection port for people who want to use a larger caliber.. Backyard Gunsmithing is not necessary if you just want to stick to totally conventional parts.
 
Battle Arms Development Enhanced Bolt Carrier Group - Full Auto M16 Bolt Carrier, 9310 Bolt, Black Nitride Finished, Laser Engraved BAD Inc. Logo. Complete Bolt Carrier Group. The new bolt carrier geometry was designed to reduce carrier tilt and the key bearing surfaces are reloacted to increase reliability. Having fewer points of contact and an ultra-hard & bricious black nitride surface layer reduce friction and improves funciton.
 
rimlick said:
I hope its something that can be fixed with the FA uppers. Seems easy enough to fix anyways. But also fairly specific issue.
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Wasn’t it already said that it was happening because of the port, being wider to accommodate the 50 beo ?
And that the FA model would not have this enlarged port and therefore the issue should be solved?
 
One thing I would like to see in the FA. The rear tang that butts up to the charging handle could be longer.

Also it seems that there isn’t enough room for the cam pin. Both uppers have a chunk out of them from the cam pin. I couldn’t put the BCG into battery with two different BCGs.
 
Brianma65 said:
Wasn’t it already said that it was happening because of the port, being wider to accommodate the 50 beo ?
And that the FA model would not have this enlarged port and therefore the issue should be solved?
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Who the heck knows. They don't exactly keep a list of updates. And I've never got one of their emails. Only way to be properly updated it seems is to pick through all of the 4-5? Modern Sporster threads going on. Then maybe it would be more obvious. But if I did that I may as well make a nice thread with a timeline of all the updates.
 
DILLIGAF said:
For the price we paid for these sets, backyard gunsmithing isn't something that should happen.
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Agreed, but it’s us the backyard gunsmiths that are forcing us to do it. The Manufacturers have machined these for Mil-Spec parts and nothing more so we need to give them a pass. Build with mil-spec parts and leave them alone and they will undoubtedly provide years of trouble free use.
 
I have a question about barrel length, gas system length, lw bcg, etc.

I plan on getting a 18.6" barrel and not sure if I should go with rifle length gas and non adj gb or less common to find, a mid length and a adj fb. Not sure if rifle length will have enough gas for lw bcm or depending on the ammo I shoot as well as have the handguard just cover the gb if adj or fully cover it if rifle length
Hope I asked the question right.

Mainly looking for 18.6 1in8 .223 wylde (prefer non fluted but dont matter too much) and medium profile in between pencil and heavy.

Also what tools will I need indefinitely to build my MS?

Thanks in advance for my suggestions and advice.
 
Sqr said:
Agreed, but it’s us the backyard gunsmiths that are forcing us to do it. The Manufacturers have machined these for Mil-Spec parts and nothing more so we need to give them a pass. Build with mil-spec parts and leave them alone and they will undoubtedly provide years of trouble free use.
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*le-gasp* you mean to say we should SOIL our lovely receivers with parts for PLEBIANS?!?!?!?!
 
I tried my rifle this weekend. Firing the first round from a single-loaded magazine, the bolt locked back and cartridge ejected to 4 o'clock direction without any unusual markings. I tried 20 rounds of Bosnian import 223, 20 rounds of the cheapest Winchester FMJ, and 20 rounds of American Eagle, all 55 gr. All functioned perfectly.

Not really a fan of the DI gas system though, seeing the amount of residue in the internals after just 60 rounds.
 
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