Modern Sporter builds Q&A

Sorry for the noob question - new to AR style rifles. Looking at an 18.6” barrel with a rifle length gas system and non adjustable gas block. Wondering which buffer/spring I should be going with to properly cycle ?
 
OntarioMarksman said:
Sorry for the noob question - new to AR style rifles. Looking at an 18.6” barrel with a rifle length gas system and non adjustable gas block. Wondering which buffer/spring I should be going with to properly cycle ?
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A mil-spec carbine extension tube and standard weight buffer will work fine. Sticking to a reputable OEM manufacturer will ensure proper functionality.
 
A standard buffer which is lighter then an H1 to start. Having a couple of alternate buffer weights on hand is always a good idea when building for experimenting to ensure the cycling is correct. You don’t want bolt carrier group bounce from excessive bolt speed, tearing of the cartridge rim, FTF and FTE issues.

Having said that spare tungsten weights on hand is also a cheaper option then purchasing complete buffers.
https://dlaskarms.com/product/tungsten-ar-15-buffer-weight/

Note: a rifle A2 length receiver extension and buffer will also match your rifle length gas system.

 
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I feel like the search function blows on this website. I searched Geissele 2-Stage SSA to see if I can get any hits. Nothing. Sooooo I will ask. Does this trigger fit without issues?
 
I tried my best, but the aluminium Strike Industries dust cover did not fit properly on my upper. The inner lip contacts on the upper side of the ejection port, doesn't allow it to seat properly. The ball doesn't fully engage and the cover will pop open with light bumps. I'm sure things could be modified slightly, but I'm not going there.

Some other folks might have better luck.

The plastic cover from Strike seems to fit though, without any interference issues. Just needed some ball detent adjustment in order to stay closed.
 
ssapach said:
I tried my best, but the aluminium Strike Industries dust cover did not fit properly on my upper. The inner lip contacts on the upper side of the ejection port, doesn't allow it to seat properly. The ball doesn't fully engage and the cover will pop open with light bumps. I'm sure things could be modified slightly, but I'm not going there.

Some other folks might have better luck.

The plastic cover from Strike seems to fit though, without any interference issues. Just needed some ball detent adjustment in order to stay closed.
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A regular mil-spec dust cover works fine. No?
 
Sqr said:
A regular mil-spec dust cover works fine. No?
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Didn't work too well for me. Had one that was pretty sloppy and would pop open from bumping the gun or slamming a mag in. And then it wouldn't always open from cycling the bolt.

So one of the Strike covers works fine and the V7 ultra light also fit and functioned quite nicely.
 
propliner said:
Mine has a bit of overlap as well:

Mz8C1OM.jpg
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I'm having a similar issue to this, but on mine, If I pull forward on the upper, then mags drop free.
I've only tested this with LAR mags.
 
Holycow said:
I'm having a similar issue to this, but on mine, If I pull forward on the upper, then mags drop free.
I've only tested this with LAR mags.
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this actually has to do with the square corners of select magazines, and the radius'd corners of the upper. The worse offenders I've encountered, actually have a dent on the magazine where the sheet metal is folded (orange follower, 10 round pistol mags), that protrudes forward from the rest of the magazine. On some receiver sets, with some mags, it's caused them to not drop free.

IF your set is having this problem, you are welcome to email us at info@albertatacticalrifle.com and we can give you the information to ship it back to us, and we can machine a little more clearance in there. This isn't something to be done to everybody's, but if your having issues don't suffer in silence, get a hold of us. It could be something really simple that's binding it up.
 
You know whats cool. The angle you guys chose for the magazine well is the same angle as those shorty LAR-15 pistol mags, so it doesnt look pants on head retarded when theyre inserted. Very nice
 
Anybody have issues with Giessele triggers, seems there's not enough room between the rear of the trigger and fixed rear pin to slide the uppers lug in there, kind of perplexed right now.
 
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