An AR15 in .22 TCM?????

[kBob]

I was thinking (a dangerous thing) about the Rock Island .22 TCM pistols and got to wondering how hard it would be to make a .22 TCM version of the AR-15.

I suppose it would have to have Armscor Rock Island magazines as a normal 9x19 magazine might be to short front to back and having "only" a 17 round magazine my be a detractor for some folks.

I was thinking it would take little more than rebarreling an upper and perhaps modifying the size or position of the gas port and adding a magazine adaptor for the Armscor Rock Island magazines.

I suppose if one had a spare 5.56 upper sitting around one could even do something as simple as placing a bushing in the chamber as was done with .30-06 Garand rifles by the Navy to allow them to use 7.62 NATO.

I suppose one might "make" a dedicated magazine by positioning a Armscor Rock Island magazine inside an AR15 magazine and fixing it in place if a magazine adaptor could not be fabricated.

As factory .22TCM has an OAL of 1.175 inches and 9x19 has a factory OAL of 1.60 I imagine other 9x19mm magazines might be "iffy" at best.

Any how, it was just a thought and I wondered if anyone had tried this or was interested.

Some outfit like PSA could easily offer upper kits and mag adaptors.

-kBob

 

[Walkalong]

I was thinking (a dangerous thing)

There is a support group for this, I have their number.

I think it's a great idea, but maybe that''s why I have the number.

 

[Walkalong]

Maybe a .22 TCM barrel on a 9MM set up would work. ???

 

[wally]

Maybe a .22 TCM barrel on a 9MM set up would work. ???

Your biggest issue will be the magazine adapter. The 9mm blocks are too short front to back for the Para P18 type magazine the TCM uses. Also the mag catch engages on the "wrong" side either you need a plumbers nightmare thing that wraps around a modified lower like done with Glock mag AR lowers, or you need to cut a catch notch in your TCM mags like done with the 7.62x25 ARs that use PPSh 43 mags.

 

[Varminterror]

Sounds like an awful lot of work to convert to a pistol mag system. The 22 TCM is a shortened 223 rem, so I'd start out by exploring the ability to modify standard AR mags. Modified followers, blocks along the rear of the mag, and some pistol mag follower spring, sure seems like you'd be in business for very low cost.

 

[maxxhavoc]

Your biggest issue will be the magazine adapter. The 9mm blocks are too short front to back for the Para P18 type magazine the TCM uses. Also the mag catch engages on the "wrong" side either you need a plumbers nightmare thing that wraps around a modified lower like done with Glock mag AR lowers, or you need to cut a catch notch in your TCM mags like done with the 7.62x25 ARs that use PPSh 43 mags.

TCM 9R ammo would work with stock 9mm mags...Yes, this could be dangerous.

 

[wally]

TCM 9R ammo would work with stock 9mm mags...

Don't think so. I have the 1911-A2 P18 clone from RIA that uses the same mag as the TCM and I have 9mm AR SBR and the 9mm AR mags are a good 0.1" shorter front to back (which will be worse inside as the AR 9mm mag metal is thicker. Also the P18 mag is a bit wider as well, although it will fit the AR magwell if you keep it in front if the "step" behind the mag catch, but this leave about no space for the mag well adapter to have "sides".

Or are you talking about some shortened TCM round to fit "normal" 9mm mags? This would seem to reduce the power level to why bother range or force very short, light bullets. I've seen the press release from 2015, ( http://news.armscor.com/blog/armsco...-designed-for-9mm-conversion-kit-compatibilit ), but so far never any of the product. I see lots of the "normal" TCM ammo and 1911-A2 9mm/TCM combos. If this is a real product it would be about as simple a conversion as possible, but is it ballistically worthwhile?

The 22 TCM is a shortened 223 rem, so I'd start out by exploring the ability to modify standard AR mags. Modified followers, blocks along the rear of the mag, and some pistol mag follower spring, sure seems like you'd be in business for very low cost.

Its like shortened by about half. Your mag spacer would halve to be in the front to have any chance of having enough feed lip to hold the cartridges which would make for a very long "free flight" to the chamber. I don't really see it as being any easier than making a mag well adapter and making a catch cutout in the TCM mags.

 

[drband]

The TCM 9R runs in the Glock/TCM conversions i regular glock mags if I remember correctly. It is a shortened TCM round.

 

[maxxhavoc]

Or are you talking about some shortened TCM round to fit "normal" 9mm mags? This would seem to reduce the power level to why bother range or force very short, light bullets. I've seen the press release from 2015, ( http://news.armscor.com/blog/armsco...-designed-for-9mm-conversion-kit-compatibilit ), but so far never any of the product. .

Yes, the modified round made to feed in Glock Mags for conversion kits.
The bullet is 1gr lighter, and has 125fps more muzzle velocity than regular TCM according to the product page. Apparently TCM had some pressure headroom.
http://armscor.com/ammo/pistol/

 

[Walkalong]

Very interesting.