Modern Sporter dedicated rimfire upper UPDATE NOV 7

Hondatech

Hondatech

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I've been thinking about this for a while, and I've seen others mention it too. If we assembled an upper with a dedicated rimfire barrel, as long as the assembled package stayed over 26" long, we would stay non restricted, and be able to plink with full capacity rimfire magazines. I'd love to build a Mk18 Mod 1"ish" upper.

What would be the best rimfire bolt kit? Is there one that uses decent magazines and has a last round hold open that uses the bolt catch? ATRS, can you guys provide the barrel for a project like this?
 
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Sorry if this is a dumb question, but how would the .22 mags fit in the lower?
And if you were to buy a barrel and bolt from Wolverine, would it just need an upper only?

Better yet, could someone please explain the full process for me :)

Thanks
 
Or if you want to go all out I'm sure Rick could order one of these in fo you

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https://www.jprifles.com/buy.php?item=JPSM22-18L16
 
jiffx2781 said:
Or if you want to go all out I'm sure Rick could order one of these in fo you

3806.jpg


https://www.jprifles.com/buy.php?item=JPSM22-18L16
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This is definitely the typein my mind: the kits (and preexisting AR upper ones) with the bolt that matches a dedicated rim fire barrel are superior. Now, that is solely my opinion of course, but I always used and liked the idea of not using some adaption bolt with the .223/5.56 barrel. I know there will be a lot of people say there is no problem with the adaption bolt systems, but I don't like the concept of the "adaption" portion in the chamber.

There are, however, other manufacturers that may do the same type of system like CMMG : https://www.cmmginc.com/product/barrel-and-bolt-group-kit-16-1-m4-22lr/
 
Aniest said:
This is definitely the typein my mind: the kits (and preexisting AR upper ones) with the bolt that matches a dedicated rim fire barrel are superior. Now, that is solely my opinion of course, but I always used and liked the idea of not using some adaption bolt with the .223/5.56 barrel. I know there will be a lot of people say there is no problem with the adaption bolt systems, but I don't like the concept of the "adaption" portion in the chamber.
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I think the big problem with adaptors for .223 barrels is any length under 18.6 could get you in a buttload of legal trouble. A dedicated .22 barrel would not.

That JP kit looks slick, I wonder if they can do shorter barrels.
 
Brianma65 said:
Sorry if this is a dumb question, but how would the .22 mags fit in the lower?
And if you were to buy a barrel and bolt from Wolverine, would it just need an upper only?

Better yet, could someone please explain the full process for me :)

Thanks
Click to expand...

It’s just like building a 9mm upper (18.6+ for NR), except for 22LR you just need 26” OAL. You need the bolt and barrel for the upper, no gasblock unless you want FSB sights. Regular handguard options, no FA needed, you can get the special dust cover that has a built in defector for the smaller cases. For the mags, buy BlackDog Machine Sonic Weld from Brownells, they’re backorder only buy they are the best on the market, make sure they’re compatible with your bolt, they use a regular magwell so it’s good to go on the MS.

My kit uses a 11” Spikes barrel and it will just make OAL with a fixed carbine stock.
 
Hondatech said:
I think the big problem with adaptors for .223 barrels is any length under 18.6 could get you in a buttload of legal trouble. A dedicated .22 barrel would not.

That JP kit looks slick, I wonder if they can do shorter barrels.
Click to expand...

This.

What we need is Rick to offer a factory .22LR SBR fixed stock rifle. It wouldnt be practical but you could then have 4.5" cmmg .22LR with fixed stock come in at around 18" OAL and remain NR. :)

Perfect gopher blaster, because why not.
 
I am definitely going to have to look at dedicated 22 LR barrels and bolts.
Dammit...why didn't I order a third or 4th upper...
 
I have both a 9" CMMG and a 16" TACSOL barrel and BCG kit. The TACSOL is much nicer looking, with a light aluminum barrel shroud over the steel barrel insert versus the CMMG steel barrel. They both run well, the TACSOL better. Don't forget they barrel ends up about 1.25" shorter than a normal AR barrel of the same stated length. So the TACSOL is a good match for a 14.5" barrel and the CMMG is, well, short. I threw a flaming pig type device on the CMMG and am running it with an airsoft Colt Canada L119A2 rail that is actually quite good for the $150 I paid for it.

Both are reasonably accurate with CCI standard velocity. The CMMG runs 1" or slightly over, the TACSOL sub 1" at 50 metres.
 
I'm Also very interested in building a dedicated .22 upper for the MS.
I'm assuming if a guy uses an adjustable stock, the measurement for NR would be with the stock fully collapsed?
 
I have a CMMG barrel/bolt and it's ok. I'm interested in trying a JP Rifles one, as it has good reviews.

I was going to go through the grey market, as the one Ca source I found was substantially higher, plus I do not want to pay for useless dust cover or high polish.

The chamber adapter kits are useless if your barrel runs faster than 1:12, IMO, and even then they are not accurate. Best to get a .22LR barrel, whatever one you decide to buy

We also need a source for reasonable price Black Dog mags. Only reasonable source I know of is not a reliable vendor any longer.
 
So if one was to build a 5" barrel dedicated 22LR with fixed stock and under 26" OAL, it should still be NR like a Mare's Leg or short KSG, correct? Is there a way to test this without risking a criminal prosecution? I stuck with over 26" OAL on my Rem 597 project just to avoid that risk...
 
ColinD said:
I'm Also very interested in building a dedicated .22 upper for the MS.
I'm assuming if a guy uses an adjustable stock, the measurement for NR would be with the stock fully collapsed?
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Since an adjustable stock isn’t needed to operate the rifle and it’s easily removable (no tools required) you have to measure from the end of the buffer tube. That’s why most are going with a fixed stock (requires tools to remove). Our laws aren’t clear to be honest, but that’s how I understand it.

rifleman762 said:
So if one was to build a 5" barrel dedicated 22LR with fixed stock and under 26" OAL, it should still be NR like a Mare's Leg or short KSG, correct? Is there a way to test this without risking a criminal prosecution? I stuck with over 26" OAL on my Rem 597 project just to avoid that risk...
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No, it had to be factory if under 26” OAL. Putting it together yourself makes it restricted.
 
I personally wouldnt go with. Conversion bolt setup if you are planning to go under 18.6".
I think you're asking for legal trouble since it can still fire 223 in less than 15 seconds.. it's a huge risk in my opinion.
Jp is the logical option here with their dedicated 22lr barrel
 
rifleman762 said:
So if one was to build a 5" barrel dedicated 22LR with fixed stock and under 26" OAL, it should still be NR like a Mare's Leg or short KSG, correct? Is there a way to test this without risking a criminal prosecution? I stuck with over 26" OAL on my Rem 597 project just to avoid that risk...
Click to expand...

We are still awaiting a reply from the SFSS guys for "the final word" in writing.
I suspect we will need to submit 1 for exam.
 
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