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yes it is the modular colt specs Colt CM762 Modular Carbine .308 WIN Semi-Auto Rifle, 16.1″ Barrel, 20-RD, M-LOK Handguard, Matte Black Finish – Colt CM762-16S COLT MODULAR CARBINE .308 SEMI-AUTO RIFLE
DESCRIPTION:
Introducing the Colt M.A.R.C.901 family of rifles. Each new rifle in the M.A.R.C.901 family is an evolution of the LE901-16S, which means the upper receiver group can be easily swapped out for any Colt upper receiver chambered in .223 Rem (5.56 x45 NATO) with the conversion kit (sold separately). Bolt and magazine controls are ambidextrous for flexibility and ease of use.
Initially developed to exceed the original requirements of a multi-caliber, single serial number modular weapon system, the Colt LE901 7.62 x 51 NATO (.308 Winchester) has the modularity and versatility you need. Its free-floating barrel and one-piece monolithic upper receiver provide exceptional accuracy. The revolutionary lower receiver and bolt carrier design enable the upper receiver group to be easily swapped out for any Colt MilSpec upper receiver chambered in 5.56 x 45 NATO (.223 Remington), without tools, in under a minute – allowing the weapon to be reconfigured to any situation at a moment’s notice. All operating controls are ambidextrous, providing you with flexibility and ease of use.
FEATURES:
Full Floated Barrel
User Configurable MLOK Handguard w/ Front & Rear Back-Up Sights
Bayonet Lug and Flash Hider
Ambidextrous Controls
Accepts Mil-Spec 5.56 Colt Uppers

David, yes Sir, this is the Modular UPC code Rifle. A 5.56/223 Upper would fit on this lower. Colt details here : colt.com/detail-page/colt-cm762-16s-308win-161-20rd-blk

Yes it is the modular colt specs continue (not enough room) SPECIFICATIONS:
Caliber: .308 Win
Barrel Length (In.): 16.1″ Heavy
Bore: Chromed, 4 Grooves, 1-12″ RH Twist
Front Sight: Flip-Up, Adjustable Post for Elevation
Rear Sight: Flip-Up, Adjustable for Windage
Extended Length: 36.75″
Collapsed Length: 33.5″
Weight: 8.8 lbs
Action: Direct Gas System, Locking Bolt
Finish: Matte Black
Handguard: M-LOK 15″ Rail