Modern Sporter - Build Discussions

[Garrettgrant]

Is 2 turns out with the buffer tube going to be to much and weaken the system? Doing the measurements I'm going to need 2 turns out for enough clearance for reliability. Just not sure how many threads can be left out before things start to weaken.

[PinaKaleada]

Is 2 turns out with the buffer tube going to be to much and weaken the system? Doing the measurements I'm going to need 2 turns out for enough clearance for reliability. Just not sure how many threads can be left out before things start to weaken.

If you look at the rear of the ATRS lower, there’s a 1/8” ish gap unthreaded until it starts to have threads. I think as long as all those threads are in contact, that’ll be the “maximum” strength anyway.

[Uisge]

On the topic of forward assists, looking to replace the out of spec TNA one I have that rubbed the roll pin. (at least I hope its not the receiver)
I'm assuming most other "name brand" FA's work fine but has anyone tried Radian's FA in either Ti of Al?

I did, tried the radian TI, it seemed to work ok, didn’t lock up like the mil-spec one. But it still seemed too close to the BCG so I went back to the mil-spec one that I shortened and tweaked to stay further away.

[Sniffer]

On top of what you mention he will also need a bolt catch, mag catch and mag catch button.

Forward assist and ejection port cover as well

You'll also need a mag release and bolt catch. I think a LPK without the trigger group would be a better option.

Thanks.

I have a mag release and a forward assist.

Are bolt catch and bolt release are same part? Or two parts? Anyone using an extended bolt release (specifically from phase 5)?

I forgot about the ejection port cover - I have been reading here that some work and some don`t - what should I be looking for?

[jiffx2781]

...

[45C]

I had no issues with a DPMS cover.

[P11]

Nvm..

[propliner]

Is 2 turns out with the buffer tube going to be to much and weaken the system? Doing the measurements I'm going to need 2 turns out for enough clearance for reliability. Just not sure how many threads can be left out before things start to weaken.

Another option is to take your buffer and grind off a millimetre or so from the plastic bumper. Just take it to the side of a coarse grinder wheel. The finish will be perfect, it grinds off clean and looks original albeit a bit shorter.

[PinaKaleada]

Another option is to take your buffer and grind off a millimetre or so from the plastic bumper. Just take it to the side of a coarse grinder wheel. The finish will be perfect, it grinds off clean and looks original albeit a bit shorter.

But you can’t put it back into a normal AR. I think a different buffer tube might actually save you money if you were going to test out different buffers. IMO

[DK23]

I'm sure this has been covered before, but going through all 180 pages is daunting.
Has anyone put together a MS in .308 or even 7.62x39?
I understand with the discontinuation of the slick side uppers which had huge ejection ports this might be trickier with the FA uppers.

anyone care to point me in the right direction? I have a friend thats working on a .223 wylde build but thought it would be cool to have one for coyotes and one for bigger things.