Modern Sporter builds Q&A

[ATRS Shaun]

I’ve taken mine out several times now from my Sporter.

I used the long punch set from TNA pushed it out as much as I could with the punch at an angle and then grabbed it with a set of pliers and tapped the pliers with something blunt the rest of the way. As always wrap the receiver in some tape if you’re worried about marring it.

Don't use needle nose pliers for this! They tend to poke through the tape far too easily when you start tapping on them. I'd sugest putting a plastic card against the side of hte receiver between the pliers and the anodizing. It's the little gouges like that, that'll keep you up at night....

[jiffx2781]

...

[BCreserveMP]

...So I am thinking that I should take out the half driven roll pin and try a new one with the above mentioned punch

Yes you should use a new pin.

[greg olmstead]

How hard would it be to run a tap into the rear bolt catch hole to be able to use a threaded bolt catch pin instead of a roll pin. The stag 10s have it and its 100000x easier and less likely to scratch the lower

[yowski]

+

Tried a different mag catch, same issue. Separated the receivers and the both LAR and AR mags catch/release properly. Tried again with the upper attached and BCG out and the problem is still present, seems like some sort of internal clearance issue with the upper receiver?

Just bought one of the RRA LAR-15 10/30 mags and it works fine, guess my upper just doesn't like the short ones for some reason. It may be due to a different style of lips, as seen in this photo. Top RRA LAR-15 10/10, Middle RRA LAR-15 10/30, Bottom AR-15 5/20.


https://imgur.com/a/PN0NrF8

[alberta tactical rifle]

How hard would it be to run a tap into the rear bolt catch hole to be able to use a threaded bolt catch pin instead of a roll pin. The stag 10s have it and its 100000x easier and less likely to scratch the lower

It CAN be done, we do this on the Modern Hunters and Modern Varmints. The cost of the lower would go up some as looooong taps are expensive and have REAL short lifespans and it adds some more run time during machining.
A threaded pin would also really cut down on availability as there are only a few makers of these pins. These specialty pins are also a fair bit more expensive than standard roll pins. Everybody wanted cheapest possible so we elected to delete many of the nice little features found in our other semi autos to accommodate the wishes of the masses.

Having the correct tools truly is the best answer, we have assembled literally thousands of AR style rifles over the years and have never had any problems

[ThatM305Guy]

Yeah I'd rather buy a 20 dollar punch than a hundred dollar bolt catch.

One of the sponsors on here sells complete armorers kits for like 70 bucks.

[Sqr]

Don't use needle nose pliers for this! They tend to poke through the tape far too easily when you start tapping on them. I'd sugest putting a plastic card against the side of hte receiver between the pliers and the anodizing. It's the little gouges like that, that'll keep you up at night....

This is what I use during builds,

https://www.amazon.ca/gp/product/B01...?ie=UTF8&psc=1

Can these tool not help on the MS?

[greg olmstead]

It CAN be done, we do this on the Modern Hunters and Modern Varmints. The cost of the lower would go up some as looooong taps are expensive and have REAL short lifespans and it adds some more run time during machining.
A threaded pin would also really cut down on availability as there are only a few makers of these pins. These specialty pins are also a fair bit more expensive than standard roll pins. Everybody wanted cheapest possible so we elected to delete many of the nice little features found in our other semi autos to accommodate the wishes of the masses.

Having the correct tools truly is the best answer, we have assembled literally thousands of AR style rifles over the years and have never had any problems

What do you suggest to remove the bolt catch roll pin? Tap it out a bit then the rest of the way with pliers? Thats what I had to do. Serious question. I want a maritime bolt catch and I put a milspec one in just to get out shooting. But after taking it out on a coyote hunt i think that a maritime would make my life just a wee bit easier with gloved hands.

[Dietz]

One of the reasons I prefer spiral pins to roll pins. Easier to take in and out, and stronger.