.22 TCM

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22TCM
From left: .22 TCM, FN 5.7×28mm, .223 Remington
Type	Pistol/Rifle
Production history
Designer	Fred Craig
Specifications
Parent case	5.56×45mm NATO
Case type	Rimless, bottleneck
Bullet diameter	0.224 in (5.70 mm)
Neck diameter	0.255 in (6.48 mm)
Shoulder diameter	0.362 in (9.19 mm)
Base diameter	0.376 in (9.55 mm)
Rim diameter	0.378 in (9.60 mm)
Rim thickness	0.045 in (1.1 mm)
Case length	1.022 in (26.0 mm)
Overall length	1.265 in (32.1 mm)
Case capacity	15.2 gr H2O
Ballistic performance
Bullet mass/type Velocity Energy 40 gr (3 g) Pointed flat nose 2,800 ft/s (850 m/s) 696 ft⋅lbf (944 J) 40 gr (3 g) Pointed flat nose 2,070 ft/s (630 m/s) 381 ft⋅lbf (517 J)
Test barrel length: 22.75" rifle (higher velocity) and 5.0" pistol (lower velocity)

The .22 TCM or 22TCM (.22, Tuason, Craig, Micromagnum) is a proprietary bottle-necked rimless cartridge created from a 5.56mm NATO / 223 Rem parent case. It was developed by custom gunsmith Fred Craig and Martin Tuason, President of Rock Island Armory (RIA) Armscor, and is used in the RIA M1911 pistols and the M22 TCM bolt-action rifle. Before the cartridge was commercialized, it was called the 22 Micro-Mag. It is similar in concept to other bottle-necked pistol cartridges such as the 7.62×25mm Tokarev and the FN 5.7×28mm. The 22TCM trades bullet mass for increased velocity and lower recoil.^{[1][2][3][unreliable source?]}