FoldAR®15 RUGER® SR-556 TAKEDOWN® SIG MCX® Rattler KEL-TEC SUB-2000™
AR-Based Design Yes Yes Partially No
Ease of Deployment Single-step Three-step Single-step Single-step
Disassembly Required No Yes No No
AR Accuracy Yes Yes No No
Barrel Length 16.1” 16.1” 5.5” 16”
Compacted Length* 17 5/8” 32 3/4” 23 1/2" 16 1/4"
Muzzle Energy 1160 ft-lb 1160 ft-lb 775 ft-lb 425ft-lb
Weight 6.1lbs 7.1lbs 5.1lbs 4.25lbs
Ballistic Energy to Size/Weight Ratio** 49
*Measured without disassembly of the upper receiver from the lower receiver.

**Calculated by combining the ratio values of muzzle energy/compacted length and muzzle energy/weight, then factored as a percentage of the highest score.