Modern Sporter - Build Discussions
- Thread starter ATRS Shaun
- Start date
Actually here's what happened to one of mine.
Gen 3 Pmags are known to cause bolt catches to "slip", sometimes partially due to the bolt catch moving rearwards if you insert an empty mag(I know, why insert an empty mag?). Nonetheless what I did was I took a C clip off of a ejection port door pivot/strut, clamped it a little tighter so it'll fit perfectly on the roll pin of the mag catch. I think a washer works too but they don’t usually come in black. Problem of slippage disappeared after.
Just noticed that ATRS changed the cut-out/machining on the lower to the right of the bolt-catch so it's flush with the rest of the receiver. Did this happen on the run 2 lowers?
Great change, that will make it SO MUCH easier to remove the bolt-catch roll pin now.
Anyone else having their rear-fixed pin start rotating in the receiver?
My buddy's build has some upper/lower play and the rear pin is spinning. Im not sure what to do to fix it, since he had me assemble it for him. This is a run #1 slick-side.
My buddy's build has some upper/lower play and the rear pin is spinning. Im not sure what to do to fix it, since he had me assemble it for him. This is a run #1 slick-side.
Lobster_pot
CGN frequent flyer
- Location
- On the shores of the Bay of Fundy
There is a dealer on here that has the Ruger AR-15 in 450 Bushmaster with an 18.6" barrel for $1499. It would be the perfect donor rifle and you'd have it a heck of a lot quicker than waiting for a barrel to be made and sourcing a bunch of other parts from a bunch of different places. 450 BM ammo is also fairly easy to source.
Thanks for the tip! That’s a good idea. I never knew that was available in Canada with the 18.6” barrel
You’re talking about the rear takedown pin right?
It’s only a cylinder with a screw (hex head) retaining it.
Maybe the screw that holds the pin in place has loosened off.
I don’t see how it can do any harm unless the screw has backed out.
You can use a pair of needle know pliers and grip onto the pin, and remove the screw that holds the pin in place, then remove the pin.
Anyway that’s the way I remember it from the first run is SS, maybe they’ve changed it up.
I thought they were changing to a push pin system.
ATRS Shaun
Business Member Rep.
- Location
- Calgary, AB
If you are local in town here, stop by and I'd be happy to take a look. I doubt the screw has come loose as we loctited those all in place. The early slick sides had a looser fit than many liked, we've tightened things up (a lot!) since then. If the small amount of play is bothering you, the best method to address that would be to bed the rear hook with some Devcon. Be generous with release agent in the lower, and VERY skimpy with the bedding material. 5 minute epoxy works as well but won't hold up long-term. Obviously strip the fire control group and safety out of the receiver before doing this.
Can confirm. My buddy from Canmore has a early set that was on the sloppy side and got it bedded, now has no play.
He just received another set from run 2 and it is perfection. Not only is the upper/lower play zero, all the parts and pins fit perfect and mags fit and release nicely(his first one was good in that regard also). He’s quite impressed with his latest receiver set.
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I think this came up before but can’t find it... dust covers.
The Brownells light weight BCG won’t activate(open) strike industries dust cover. The JP BCG will.
I seem to remember reading somewhere that people might have had the same issue but it(the Brownells LW BCG) worked with standard dust covers?
Any ideas?
The Brownells light weight BCG won’t activate(open) strike industries dust cover. The JP BCG will.
I seem to remember reading somewhere that people might have had the same issue but it(the Brownells LW BCG) worked with standard dust covers?
Any ideas?
All I did to get my Brownells LWBGC to open my strike industries dust cover was a drop of JB weld epoxy on the inside of the dust cover. You don't need much, just a little bump. I roughed up the plastic first and bought plastic specific epoxy
Ok thanks, maybe I'll try this.
Hey everyone. Having a bit of trouble selecting a handguard. I have a BSF Barrel with a .875 Superlative gas block. I tried a MRA V1 however it wouldn’t free float without taking material off the gasblock and handguard. Was looking at a Timber Creek Enforcer 15” handguard but not sure if clearance would be any better.
Does anyone have any suggestions for a handguard that will allow for good clearance with this barrel and gas block combination?
Does anyone have any suggestions for a handguard that will allow for good clearance with this barrel and gas block combination?
Around 250ish. When did you order one?
ATRS Shaun
Business Member Rep.
- Location
- Calgary, AB
To be exact serial ATRS18-MS-000223 was the last lower receiver in the first production run, before we switched over to making uppers for run one, and stockpiled uppers for run two. Then we switched basically all the machines back over to lowers, and now we're getting ready to do the same thing over again.
zKn0xvillex
Member
- Location
- Windsor, Ontario
Hey guys, sorry if some of this is already discussed it's hard to find things in the 200 pages here.
I am having a hard time with the roll pins for the forward assist and bolt catch. I ended up breaking the bolt catch roll pin so i am ordering a new one but having a lot of trouble. They are from a Geissele LPK and i made sure to put oil before putting them in.
My other issue i'm having is that the rod for the dust cover is too long and pokes out to where the threads are for the barrel. It is from TNA
Any help is appreciated thanks
I am having a hard time with the roll pins for the forward assist and bolt catch. I ended up breaking the bolt catch roll pin so i am ordering a new one but having a lot of trouble. They are from a Geissele LPK and i made sure to put oil before putting them in.
My other issue i'm having is that the rod for the dust cover is too long and pokes out to where the threads are for the barrel. It is from TNA
Any help is appreciated thanks
