So still not 100% done with this , still waiting on the new scope but this lil guys has been interesting. Long story short.22 TCM is kinda a .22 cal 9mm...but not really , I'd call it a more modern .22 hornet honestly.
Vs a 9mm and 5.56



Anyhow built mine with a 8" KAK barrel and buffer spring kit , genetic 9mm bcg and PSA pistol lower. It's a direct blow back deal so honestly building it was stupid easy. Really wish they would make at least a 10.5-13" like their doing with their 7.62x25 tokerv barrels but eegghhh.



So the magazine is a lil tricky. I'm going with KAK's recommendation of using an 9mm Endo mag. Which is a cool lil deal where you basically just swap the guts out of a regular pmag with the Endo mag guts and boom you can shoot 9mm out of a regular lower If you where using a full size 30rd mag it's honestly like a 2min job , not even joking...but I hate 30rd mags on most of my stuff so going with a 10rd mag had to modify it a lil. Which now that I know how to do this....I'd say 5min ?





So legit all thou doing is cutting the place but down to fit the mag ( minute with a hack saw) cut the spring down and slip the 9mm rear follower out. Easy easy.

Now deal is , this I Perfect for factory ammo but if you like me and wanna do some cool stuff... N Ed a lil mod modification to make it so you can load out longer COAL / longer bullets . Still honestly not super hard..just cut the front follower out and use a Dremel to re do the ramp a bit...another 2-3 min no that I know what to do





Now it feeds the longer dummies perfect but the shorter ones , you need to push the forward or you have feeding issues....which honestly all you need to do tap the mag against you hand after you load the mag and it moved them all forward.

So you can also make your own brass for this lil guy out of 5.56, pretty similar to .300blk..a lil tedious but I was fun. And I have BUCKETS of 5.56/.223. so just used a little jig I bought and a mini cut off saw to cut my cases down

Quick annel, 10mm socket with a bolt works good for the drill


Quick chamber and deburr to get rid of all that crap from cutting to keep it out of my die


Then spray it doing and let lube flash off


Then it's just a one step resizing process



Also if your wondering what happens if you don't anneal....other then it being a heck of a lot harder to form in the press


Vs a proper one


Now as gotta trim them down a bit and had to bring this old girl out...a long with modifying one of the pilots because I didn't have a .22 cal one




Another quick chamfer and de burr ( a long with getting rid of the crimper primer pockets )


Aaannnd then wet tumble for a bit to get all that lube off then Into the dryer



Now as far as shooting.... Had a bug or two to work out. Main was this barrel really needed a chamber polish , which honestly isn't difficult. 30cal brush with a patch some JB bore paste on the end of a short cleaning rod and a drill, no more stuck cases and like 10min..b no e if they can from the factory like that but haaayyy you sell me a $110 barrel I'm just expecting to do a lil work to it. Other then that and giving out so. Stuff with the mag



Factory Ammo and this lil stuck with a 8" barrel is right here with the fastest .22 mag in a full size rifle so I'm BEYOND excited to try hand loading

I swear if they would make at least a 16". Barrel re do that chamber and mags for longer COAl ...maybe lengthen the case...shoot, call it the .22 hornet short Magnum and RUN with it heck neck this down to .17 cal and get some good 25-30 gr hp's made ? By by .17 hornet

Well anyhow I got some 40gr vamxs to load up, figured now that I added a lighter triggers and the new scope is coming in soon I'll be able to actually shoot some serious groups vs just function testing lik indid today lol

I am assuming this is blow back gun , given that the bolt was for both barrels

blow back 9's require you really play with your buffer weights

if you under weight your bolt slams into the end of your buffer tube.

if you are over weight you don't cycle

they appear to make 10 round endo mag conversions

keep posting I am very curios to see how this project turns out

accuracy and blow back don't often go together so we will see what you get I think it is going to make your 22 hornet groups look good.

Yep strictly blow back , and KAK did all the watcha call it and they give an option when your buying the barrel for you to add on a .308 buffer spring and weight, apparently with all their testing that's what they found out works the best so I just got that with my barrel


And yes I went with the Endo mag, didnt see the 10rd version...well they have the one for 9mm but don't know how well it would work here .
Anyhow this is KAK's video on the subject

Now something odd I'm seeing while going though the brass is a bit of inconsistent fire forming not sure what's going on here





Also made some dummies . This is a 1:7 twist so I actually have a possibility for alot to play with.
To 40gr factory 35gr vmax 50gr vamx 45gr hornet SP 55gr sp 63gr Cast HP

Maybe not enough powder to form the case to the chamber?
That round mildly resembles the Russian macarov cartridge. Forget the name of it. It's a nasty little bugger

Most interesting thing I have see from the tmc for me is a guy on another fourm was Turing their small tmc bolt gun into 9mm with 4" barrel and internal suppressed barrel to get it back to 16". With 147gr 9mm it's subsonic hits hard and is a nice light compact pellet gun quite rifle with nice size appropriate bolt action.

Same guy was re working the bolt face and made some in .45 acp also.

Yeah I've seen a few of those

it is a real balancing game you want to find one ammo , tune for that and stick to it

also blow back is filthy be ready to clean often

there was a kit for years to turn a Mauser into a 45acp suppressed gun
the head is already correct so it was new bottom metal that tock 1911 mags and a barrel or integrally suppressed barrel 45 let you go heavier and plane old 230gr ball ammo is always sub sonic.

There are a lot of cool projects out there. But lack of allocation of time and money to them theblast several years has moved them from the back burner to ya that's stuff I used to do and be interested in category. Honestly I have not done or bought a thing for me in years. Everything is for the wife and kids. BUT after this morning I believe that's going to change.

Well on the bright side I clean pretty frequently, at least the barrel. Gave her a once over today. Three patches of JB short stroke , dry patch it till it's daily clean then two of solvent , dry patch it out then some rubbing alcohol. Honestly it's about what I expected for something using pistol powder

So also did my first hand loads today. There's actually not a lot of data on this lil guy but common consensus is to use .22 hornet data. And since this is a bottle neck I thought .22 k hornet would be a little more appropriate.

Was either h110 or lil gun and from my experience with the hornet lil gun is a lot cleaner. And more consistent so gonna try a base chare of 7.8gr

And these lil guy are just adorable loaded with these 45gr Vmaxes

So fist shots with my hand loads and ..egh, definitely not enough gas




About go ahead and just bump up to 9.0 gr

9.0 high velocity lower S-D ok group still not enough gas. Going to 10.0

Ok so if I was in a drag race I'd be stomping.22mg right now....but still not running the gun...still have plenty of case room so 11.0 it is...really think I'm gonna have eto most to a different powder because I'm just not generating the pressure needed

Alrighty went all the way up to 11.0 grain and at this point I'm just calling it. Something else needs work



So now all I can think is the buffer spring and weight are just plain too much for this combo. So went inside replaced the .308 KAK spring with the mil spec one but kept in there heavy 9mm weight

Loaded up five more but at 10gr just in case something squirrely might happen and shot it again . This time I got pretty decent function 3 outta five ..buuuut getting a different fire form. The right one is what I've been getting with the heavy buffer and the left is what this round got

you need to back down that is danger zone that means the case is headed back while case is still under way to much pressure.

blow backs get dangerous when you have an out of battery detonation and it is easy enough to have happen especially if your making disappearing necks

Ok so the last two days have been a bit of a cluster with this lil guy, and I have to be some sort of crazy because I've been enjoying the process.....now the process includes me wanting to ram my head though the wall but haaaayy. So sorry if this is a bit rambling and random

So, to skip over a lot of extra stuff ,long story short my home made brass has been the main problem . And I gotta say , I feel a bit stupid because I've NEVER messed with neck turning and all that so this is a new deal for me. Now the main problem I've been having over a good no ejection. This lil guy is actually a great shooter ( for the whole 50yd I've been shooting)

Anyhow not the best deal but my brass

Factory brass

And look I know I need to get some nice mechanical calipers instead of digital....but I'm kinda stupid and can barely remember how to read a tape measure so ...


Now , again be not knowing just diddly about the importance of neck thickness ( again I've never messed with turning necks and all that, a long with the fact NO one is really messing with this lil cartridge, especially like how am. All the brass from I've seen is , cut 5.56/.223 to length anneal , resize/ form , trim , load shoot, , sooo from looking at what everyone else does and it worka the idea of needing to turn necks never crossed dmy mind)


So which that being said I stared really goin into the weeds , reading about 9mm blow backs , buffer weights springs buffer tubes , watching and rewatching the two videos KAK did on this and the 7.62x25 tokerv. Saw a lil tid bit on kaks site taking about using a carbine buffer tube . Sosonc ei had a AR I never really shoot with one and a old SBA 3 brace sitting around ( and from what I read this is completely legal...... though this crap has been bouncing around so much last two years I could have changed an hour ago and the ATF might be on the way to shoot my dog and toss me in prison...who knows. I swapped them around . Also tossed back in the mil spec trigger ( had a Kaw Valley reduced spring kit)


At this point I was doing. Everything with the gun right my loads just weren't hot enough to generate the pressure I needed ( look I'm not an expert, not claiming to be an expert, probably will blow my face off one of these days lol. But when you only have like two published loads , with powder you can't get , no one with any experience doing what your doing ..... Welp baby steps lol. That being said it seems to be a common consensus that using hornet data and work up is the way to go). So stared loading a bit heavier looking for pressure and the deal is with both lil gun and H110 I really don't see anything with he higher chargers that I wasn't already seeing with the lower charges. Where there definitely could not have been problems


On a side note I did start seating my bullets a bit deeper . Somone mention the longer COAL/CBTO that I was doing could possibly be a problem. So stared seating deeper and actually had a few cycle ! Anyhow, with the new carbine buffer and the old mil spec trigger along with the new loads I actually started getting more signs of the gun trying to cycle


Along with some BEAUTIFUL case forming ... For the most part


Also was able some wild velocities from this lil 8.5" barrel

Also with the old mil spec trigger back in I wasn't getting those stupid bulged primers constantly . Now I still got them but not every/ Evey other round like before . O and talking about primers . Somone made the comment that converted brass was still rifle brass so a small rifle primers would probably make more sense then a small pistol and seems so with the AR small rifle match ones.

So at this point I was about at my wits end and said screw it. 12.0 GR of H110 and

Funny enough only got one bulged primers

Well still no ejection at this point I dropped back down to a mid level load and said I wanna see what would happen if I trimmed the buffer spring. I know this is something 9mm blow back and suppressed guys will do at times , and a new spring is like $20 so why not. So popped off a coil and GOT AN EJECTION!

......that end up being a case head separation lol. Lil paper towel, some cero safe and a cleaning rod and poof

First one I've ever had sooooo was a fun l problem solving deal.

Well there was some factory ammo just sitting on the kitchen table and I was just like " why not " grabbing them , loaded them and boom boom boom perfect cycling into the dirt!
So at this point I'm at my wits end I've done everything..... except try to reload the factory brass. So said screw it , when in side found a few , resized and loaded them with one of the most mild loads I had ( like 10.0 GR of lil gun I think) and I'm honestly not expecting much aaannnd boom boom boom CYCLING AND LOCK BACK !
was it the necks being too thick ? Was it the coating this brass apparently has. ? Idk but it works ! So went to down and grabbed 2 50rd boxes .
Spent the last hour shooting this stuff though the gun with different combos of buffer tubes and springs ( always used the KAK blue top weight) and THE THING JUST WORKED REGARDLESS!

And I've been horrible keeping track of everything between doing chores and what not and can't quite remember if this was with th pistol or carbine buffer tube but the forms are interesting.

This group is from using the KAK spring and weight

And this was the one with the standard spring and KAK weight