MAC 11 conversion to .22TCM?
- Thread starter Slowmo
- Start date
ahem
Just an update on my 22TCM9R barrel adventure.
I tried the full size CFW tungsten bolt with a standard M11/9 recoil spring and one of the Lage thicker/softer neoprene buffers and the rate of fire and recoil was still ridiculous.
I have one of the Practical Solution Mini-Uzi side folder stocks on my M11 where the stock backplate has short arms that go into the receiver and it gets locked down with a friction style bolt that replaced the OEM spring loaded mag catch.
The recoil with the 22TCM barrel even with the full size tungsten bolt, full size recoil spring, and softer buffer is to the point that even when shouldered the stock was essentially getting "slide hammered" out of the back of the receiver due to the rearward recoil impulse. After shooting a handful of rounds I noticed a growing gap between the receiver backplate and the stock backplate as the rearward recoil was intense enough that the stock started sliding out the back of the receiver. Thinking "that's odd" maybe the stock retaining bolt was not tight enough, I loosened the retaining bolt, slid the stock back in to the rear of the receiver so it was flush with the backplate again, and tightened the stock retaining stock bolt good and tight. I shot maybe another half mag of rounds and sure enough the stock was sliding out the back of the gun again.
I also noticed that in order to get the gun to run in full auto I had to remove the semi-auto disconnector. It seems like the recoil energy is enough and the gun jumps bad enough that the recoil impulse alone is able to make the semi-auto disconnector lever knock the disconnector hook off the trigger even when set to full auto. So even in full auto it was primarily single shot with a rare 2rd auto burst. (never had this issue in the 25 years I have owned and shot this gun in 9mm) Only way to get "reliable" full auto (minus the FTF failures) was to remove the semi-disconnector at which point it was full auto until the next FTF failure.
At this point out of concern for damaging my M11 receiver by blowing out the backplate or egging out the front pin hole given the clearly perceived increase in recoil and ROF, the stock being slide hammered out of the back of the gun and the weird semi-auto disconnector issue, I stopped testing and am calling it a day with this barrel.
On top of the recoil issues, overall reliability is also really poor, where I was lucky to get three or four rounds off before a FTF jam/failure occurs. Given the number of FTF failures its also probably just a matter of time before you get unlucky and the fixed firing pin finds a primer with the round not properly seated in the chamber.
At this point, I am probably going to sell the remaining couple boxes of 22TCM9R ammo and dispose of the 22TCMR9 barrel out of liability concerns.
I tried the full size CFW tungsten bolt with a standard M11/9 recoil spring and one of the Lage thicker/softer neoprene buffers and the rate of fire and recoil was still ridiculous.
I have one of the Practical Solution Mini-Uzi side folder stocks on my M11 where the stock backplate has short arms that go into the receiver and it gets locked down with a friction style bolt that replaced the OEM spring loaded mag catch.
The recoil with the 22TCM barrel even with the full size tungsten bolt, full size recoil spring, and softer buffer is to the point that even when shouldered the stock was essentially getting "slide hammered" out of the back of the receiver due to the rearward recoil impulse. After shooting a handful of rounds I noticed a growing gap between the receiver backplate and the stock backplate as the rearward recoil was intense enough that the stock started sliding out the back of the receiver. Thinking "that's odd" maybe the stock retaining bolt was not tight enough, I loosened the retaining bolt, slid the stock back in to the rear of the receiver so it was flush with the backplate again, and tightened the stock retaining stock bolt good and tight. I shot maybe another half mag of rounds and sure enough the stock was sliding out the back of the gun again.
I also noticed that in order to get the gun to run in full auto I had to remove the semi-auto disconnector. It seems like the recoil energy is enough and the gun jumps bad enough that the recoil impulse alone is able to make the semi-auto disconnector lever knock the disconnector hook off the trigger even when set to full auto. So even in full auto it was primarily single shot with a rare 2rd auto burst. (never had this issue in the 25 years I have owned and shot this gun in 9mm) Only way to get "reliable" full auto (minus the FTF failures) was to remove the semi-disconnector at which point it was full auto until the next FTF failure.
At this point out of concern for damaging my M11 receiver by blowing out the backplate or egging out the front pin hole given the clearly perceived increase in recoil and ROF, the stock being slide hammered out of the back of the gun and the weird semi-auto disconnector issue, I stopped testing and am calling it a day with this barrel.
On top of the recoil issues, overall reliability is also really poor, where I was lucky to get three or four rounds off before a FTF jam/failure occurs. Given the number of FTF failures its also probably just a matter of time before you get unlucky and the fixed firing pin finds a primer with the round not properly seated in the chamber.
At this point, I am probably going to sell the remaining couple boxes of 22TCM9R ammo and dispose of the 22TCMR9 barrel out of liability concerns.
Last edited:
A&S Conversions
UZI Talk Life Member
What is the ammunition that you are using? The one I listed above was double the energy for 9mm. Maybe there is a lower energy loading available?
Scott
Scott
I was using the factory Armscor 22TCM9R 39gr Jacketed Hollowpoint.
https://www.outdoorlimited.com/hand...50-39-grain-jacketed-hollow-point-250-rounds/
I don't think there is any other brand other than Armscor and that is Armscor's only loading option.
https://www.outdoorlimited.com/hand...50-39-grain-jacketed-hollow-point-250-rounds/
I don't think there is any other brand other than Armscor and that is Armscor's only loading option.
Gaujo
UZI Talk Supporter
I should. I will check and post back.
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