MK18 Mod0 in 22lr, possible/feasible?

ASH556 · #1 04-03-12, 10:28

I want a 22lr AR to have for cheap plinking and backyard varmint control. Just for fun, I'd like to make it a clone of a MK18 mod0 in terms of a 10.3" barrel, fixed FSB and rear sight, Aimpoint M2 (or clone), etc. I figure if I'm going to SBR a gun, I'd rather do it on a useful AR lower instead of a plastic MP15 lower. Where I'm not sure is the upper. I guess I buy/build a dedicated 22lr upper from someone like CMMG? Any reliability issues with cutting the barrel back? Do any actually operate like an AR with bolt lock, etc?

agr1279 · #2 04-03-12, 10:54

You can try http://core15rifles.com/home.html. They are right now doing 16" barrels but they might work with you. Contact Justin and he can help you out.

Dan

usmcvet · #3 04-03-12, 11:20

This is my CMMG upper. It has a 16" bbl but because it's a .22 the bbl of this 16" looks like it is a 14.5" bbl. I would like to send it out to be cut and want to leave the FSB intact so it will look and feel like my 10.5" and 11.5" guns. I will have the bbl cut just behind the M4 cut so I think it will be about an 8.8" bbl. Lots of folks run these at 4" with no issues. I think they're doing it to keep ammo as quiet as possible with a suppressor.

usmcvet · #4 04-03-12, 11:24

Bolt catch does not operate as usual with my set up. There are BHO magazines that are said to work.

I holds open on an empty magazine but not w/o a magazine.

SeriousStudent · #5 04-03-12, 22:04

I have a Tactical Solutions AR-22 M4 upper that I am probably going to do exactly that with. I have it running on a Charles Daly lower I built up with a G&R LPK. It runs like a raped ape.

I have the AR-22 M4 model.

http://www.tacticalsol.com/tshome/ar22-22lr-conversion

http://www.tacticalsol.com/tshome/wp...2011/08/m4.jpg

I am going to thread the barrel and put a .22 can on it. Might as well go whole hog, while I'm having fun.

It's currently set up as a copy of my BCM middy. MOE handguards, CTR stock, Aimpoint H-1, Surefire X300, VCAS sling. Very, very handy and very cheap to run.

RichDC2 · #6 04-03-12, 22:34

I have built this with a CMMG LW barrel and a Colt lower to match my 6720 as much as possible, I put a Primary Arms Micro in a AD mount that has the same exact height as the T-1 in the LT660. The only downside is there is no last round bolt locking back device that i know of .I did get the bolt assist option. It works very well with American Eagle 36gr. copper plated. Head shots are made just like the 5.56 standing out to about 75yrds, more than that know your holdovers. Pm Shadowcop he is the CMMG hookup here.

spring1271 · #7 04-03-12, 22:54

I bought a 16 Inch CMMG 22 barrel from Brownells and sent it to Adco. They cut to it 10.5 and I built a 22 Mk18 Mod1 to match my Noveske. I use the CMMG bolt hold open device and it works perfectly with there BHO mags. Its fun and cheap to shoot!

ASH556 · #8 04-03-12, 23:11

Quote:

Originally Posted by spring1271

I bought a 16 Inch CMMG 22 barrel from Brownells and sent it to Adco. They cut to it 10.5 and I built a 22 Mk18 Mod1 to match my Noveske. I use the CMMG bolt hold open device and it works perfectly with there BHO mags. Its fun and cheap to shoot!

Pics please!!!

usmcvet · #9 04-04-12, 12:21

Quote:

Originally Posted by spring1271

I bought a 16 Inch CMMG 22 barrel from Brownells and sent it to Adco. They cut to it 10.5 and I built a 22 Mk18 Mod1 to match my Noveske. I use the CMMG bolt hold open device and it works perfectly with there BHO mags. Its fun and cheap to shoot!

Does the 10.5" bbl look like it is 9" long or am I remembering the measurements wrong?

spring1271 · #10 04-04-12, 16:22

Only pic i have right now.

spring1271 · #11 04-04-12, 18:30

Better pics! But i am no photographer!!!

Pistolero · #12 04-04-12, 19:12

Maybe this is taboo but I've probably put ~4-5K rounds of 22lr through my colt 10.3" upper using a cmmg conversion kit, still running fine no problems. So is the AAC M4-2000 that's usually on the end =D Just toss it in the dip once in a while and shake it around till a bunch of crud falls out!

Royalflush · #13 12-10-12, 03:24

Quote:

Originally Posted by ASH556

I want a 22lr AR to have for cheap plinking and backyard varmint control. Just for fun, I'd like to make it a clone of a MK18 mod0 in terms of a 10.3" barrel, fixed FSB and rear sight, Aimpoint M2 (or clone), etc. I figure if I'm going to SBR a gun, I'd rather do it on a useful AR lower instead of a plastic MP15 lower. Where I'm not sure is the upper. I guess I buy/build a dedicated 22lr upper from someone like CMMG? Any reliability issues with cutting the barrel back? Do any actually operate like an AR with bolt lock, etc?

Wait- I may not be understanding this correctly. you want a practical SBR, right? Why not by a 5.56 MK18 upper (either factory, or a build. You can find some good deals on home built mk18 clones) and get you a CMMG .22 conversion kit? I've ran the .22 kit out of my 16" AR with excellent results in accuracy.
If you are wanting to buy an upper, have the barrel cut and re-threaded you'll probably spend close to $500. Try to find you a nice 10.3" 5.56 upper w/o a BCG for around $425 and pick up a conversion kit. Then all you gotta do is wait for a 5.56 bcg to come around for 80-100 bucks used and you have a fully funtional 5.56/.22 gun.
One thing I DO agree with is get you a nice lower to SBR- you'll be keeping this for the rest of your life most likely, so spend an extra hundred bucks and get the one you want. i went with a cheap Spikes blem, but I wish I'd had went with a DD stripped lower (even though it's doubtfully better) so it would match my DD MK18 upper

4DAIVI PAI2K5 · #14 12-10-12, 08:12

Not a Mod 0 but its a Mk18. My dedicated .22 upper and lower. It is a CMMG upper that I had cute down to 12" (1.5" of a .22 barrell is inside the receiver)by tactical turtle on ar15.com.

Waiting on PA to get more mirco's in stock then I'm putting one on my little plinker. Just got the noveske end plate and Gear sector qd mount pu ton my I don't have any updated pics, I've also changed the grip again, back to an A2 the i dremeled down and fully stippled lol.

ASH556 · #15 12-10-12, 09:46

Quote:

Originally Posted by Royalflush

Wait- I may not be understanding this correctly. you want a practical SBR, right? Why not by a 5.56 MK18 upper (either factory, or a build. You can find some good deals on home built mk18 clones) and get you a CMMG .22 conversion kit? I've ran the .22 kit out of my 16" AR with excellent results in accuracy.
If you are wanting to buy an upper, have the barrel cut and re-threaded you'll probably spend close to $500. Try to find you a nice 10.3" 5.56 upper w/o a BCG for around $425 and pick up a conversion kit. Then all you gotta do is wait for a 5.56 bcg to come around for 80-100 bucks used and you have a fully funtional 5.56/.22 gun.
One thing I DO agree with is get you a nice lower to SBR- you'll be keeping this for the rest of your life most likely, so spend an extra hundred bucks and get the one you want. i went with a cheap Spikes blem, but I wish I'd had went with a DD stripped lower (even though it's doubtfully better) so it would match my DD MK18 upper

Thanks for the input, but I actually DO HAVE a Factory DD MK18. I'm not super keen on .22 kits, hence the thread on a dedicated .22 or upper.

shadow65 · #16 12-23-12, 10:53

The .22 barrel is approximately 1.5 shorter than an equivilant 5.56 barrel in regards to how much is outside the receiver.
I've seen many guys send a .22 barrel to get it cut and are disappointed when it's returned. Not the length they were looking for.
Dave N

usmcvet · #17 12-23-12, 12:38

My patrol rifle is a FA Anvil Arms lower with an LMT tube to replace the commercial spec tube it used to wear. CSACT rear peep. Magpul furniture, it has a BlueForce padded two point sling on it. A SF mini scout in a Mount n Slot Scout Mount. A BCM 11.5" bbl and an old Colt slick side upper. Spare batteries in the pistol grip.

The flat top upper is my CMMG .22 trainer. ADCO cut it so the OAL matches my 11.5" upper, I think it is closer to a 12.5" .22 bbl. it has a DD BUIS on it. A Magpul scout mount and HK sling mount. The 5.56 upper has a Mount n Slot HK sling attachment point on it. They're close enough. I should change the sling mouts to match.

usmcvet · #18 12-23-12, 12:40

Shadow. Any more word on a CMMG FA kit for .22's?

pedropcola · #19 12-23-12, 16:28

I mentioned this on another thread but here goes anyway. My ST22 upper would lock back on an empty mag but remove the mag and the bolt goes home. This is how the Spikes works. I don't like that for many reasons. I found the Better Mag S&W adapter from boonie packer . It mounts easily in the mag well and lets you use the S&W mag from a 15-22. Better mag and it now operates as a fully functioning bolt hold open. Runs just like a standard AR in bolt hold open terms and I have found that it runs nearly 100% with all cheap bulk pack which my ST22 wouldn't do running Black Dog mags.

mikeith · #20 01-20-13, 22:15

Quote:

Originally Posted by 4DAIVI PAI2K5

Not a Mod 0 but its a Mk18. My dedicated .22 upper and lower. It is a CMMG upper that I had cute down to 12" (1.5" of a .22 barrell is inside the receiver)by tactical turtle on ar15.com.

Waiting on PA to get more mirco's in stock then I'm putting one on my little plinker. Just got the noveske end plate and Gear sector qd mount pu ton my I don't have any updated pics, I've also changed the grip again, back to an A2 the i dremeled down and fully stippled lol.

is that a replica mk18 rail(airsoft)? i just assembled my cmmg 6.5" upper and was wondering if i could use one of them by spending $120 instead of $300+ on a real RISii