Glad I could help, I prefer the clamp on but any should work fine.
Modern Sporter - Build Discussions
- Thread starter ATRS Shaun
- Start date
Glad I could help, I prefer the clamp on but any should work fine.
Feralmetal
Member
- Location
- Saskatchewan
So all this talk of dust covers, I'm still looking at ordering one for my slick slide upper, is there somewhere that has compatible ones in stock?
Feralmetal
Member
- Location
- Saskatchewan
There's no way that I can read through 179 pages here. I'm looking for a quick recap from anyone that's built one of these.
Is there anything specific that I need to look out for beyond a standard AR build? I've built dozens of AR's, so I'm not a noob in that category.
I plan on building the lower with a standard LPK and trigger with a carbine buffer tube. The upper is going to have a MRA barrel and an American Defense 15" rail.
Is there anything specific that I need to look out for beyond a standard AR build? I've built dozens of AR's, so I'm not a noob in that category.
I plan on building the lower with a standard LPK and trigger with a carbine buffer tube. The upper is going to have a MRA barrel and an American Defense 15" rail.
Has anyone installed an Aero Precision forward assist on their MS? I've done AR builds before but never installed a forward assist. When I put the forward assist into the upper and look thru the roll pin hole, I can see that the flat on the FA protrudes into the hole and the roll pin won't insert. My roll pin punch, which measures .086" won't go thru but my punch that measures .077" will. The roll pin that came with measures about .095" (3/32").
Is the hole on my upper a bit off, FA out of spec or? I could file down the FA so it doesn't protrude into the hole or use a smaller pin but I'm looking for other opinions.
Is the hole on my upper a bit off, FA out of spec or? I could file down the FA so it doesn't protrude into the hole or use a smaller pin but I'm looking for other opinions.
- Location
- Red Deer, Alberta
Most everything fits. Stuff that doesn't work that comes to my mind quickly as follows:
Uppers: if you have a early Forward Assist Upper, some of them were made with the FA too close to the centerline of the BCG (0.080" if memory serves me correctly), thus some forward assists will interfere with the BCG (strike industries).
Triggers: Hiperfire Competition (24C) style trigger will not fit, Geissele High Speed National Match trigger will not fit unless you have the rear pin mod done. All other Geissel triggers are fine as far as I know.
Handguards: some with anti rotation tabs (to fit a milspec forged upper) will have to have the tabs either modified or removed.
Port Door / LW BCG issue: Some lightweight BCG's (like the brownells one) are shaped in such a way that it will not open the port door. But the same BCG will in a normal AR15, so we suspect the ATRS upper has the port door sitting a little bit further away from the centerline of the BCG. Also you will need a straight port door rod, milspec with the tiny c-clip removed is fine.
JP Enterprises .22lr barrel & .22lr specific bolt carrier group: A small notch needs to be cut in the barrel extension so the upper can be assembled. This is due to the MS having a shorter upper than a AR15.
Magazine Catch: I believe someone had problems with a magazine catch???? I don't remember which one, might have been strike industries or some titanium one. I don't remember exactly.
Those are the 'big' issues I see people mentioning in the threads.
302paterson
New member
- Location
- The lower mainland
Has any one done a big bore build. 450 bm 458 socom or 50 baowulf. Just curious to know if nr barrels are available.
If no big bore then what about pistol calibers.
If no big bore then what about pistol calibers.
I used a TNA barrel for 50 Beowulf.
jagermyster
CGN Regular
- Location
- British Columbia
So i have a question regarding the installation of a bcm mcmr rail. It says on the instructions that i can put oil on the outside of the barrel nut to help the rail slide over but to not use any kind of grease. Why would this be???
I got everything put together today. The only things that are causing me a bit of issue are the mag catch causing a bit of interference with magazines inserting all the way, and the BCG/charging handle is a little tight. I didn't have a lot of time to play with it, but everything else went together well. I'll shoot it this weekend and see how it works!
So everything is all good on my build right now, except Pmags get stuck in the magwell. I've got to give them a whack to seat them, and then they are stuck in there good. All my other mags work fine and drop free. Is this a common issue? I've tried adjusting the bolt catch. I also found it interesting that they only get stuck when the upper is attached. Bolt open or closed doesn't matter.
Different platform but my SLR does that, the upper is a little tight where it mates up to the lower just above the mag well. If you look on the mag you should be able to see the marks right up at the top. Most of mine have broken in now so they don’t get stuck too bad anymore. It’s my coyote gun though so I’ll use those mags when hunting as they don’t rattle.
For now I put in an undersized roll pin, it seems to function fine. I will order a new FA and see how that goes.
Thanks,The handguard on this build is 13.7" long. There is less than 1/8" of gas block sticking out past the end of it. A 14" handguard would completely cover it.
I had a BCM KMR on my MV, but not sure/ can’t remember, if it would be the same for MS.
So far the only 14 in. HG I can find is a MWI from Brownells.
Wouldn’t happen to k ow of any other 14 in. HGs???
How do you find the barrel , for accuracy?
I’m leaning towards that or IBI.
Not sure if anyone else has had this issue, don't remember seeing it before.
Put a friends rifle together the other day and took it out to test fire. Only fired 15 rounds but seemed to function fine. I did notice that when the bolt held back it was stopped on the bolt carrier, not the bolt face. I didn't think too much about it at the time, because it was cold, but it started to eat away at me after I got home.
I checked the gun again and pulled the bolt all the way back using the charging handle and it just barely clears the bolt catch, by about 3/16". I check this against other rifles and they are in the 3/8" range. I measured the inside length of the buffer tube (6 15/16"), the buffer and the spring. Then I measured a CC as a reference, all these measurements were the same. I measured from the flat face of the bolt catch and the flat face of the inside of the lower where the buffer tube threads into. The MS measured 9.1cm and the CC measured 9.6cm.
The only solution I see here is either cutting the buffer pad to make up the difference or getting a buffer tube that is 1/4" longer.
Has anyone dealt with this before? Any ideas or suggestions?
Put a friends rifle together the other day and took it out to test fire. Only fired 15 rounds but seemed to function fine. I did notice that when the bolt held back it was stopped on the bolt carrier, not the bolt face. I didn't think too much about it at the time, because it was cold, but it started to eat away at me after I got home.
I checked the gun again and pulled the bolt all the way back using the charging handle and it just barely clears the bolt catch, by about 3/16". I check this against other rifles and they are in the 3/8" range. I measured the inside length of the buffer tube (6 15/16"), the buffer and the spring. Then I measured a CC as a reference, all these measurements were the same. I measured from the flat face of the bolt catch and the flat face of the inside of the lower where the buffer tube threads into. The MS measured 9.1cm and the CC measured 9.6cm.
The only solution I see here is either cutting the buffer pad to make up the difference or getting a buffer tube that is 1/4" longer.
Has anyone dealt with this before? Any ideas or suggestions?
