It's the caliber that's beloved by the commando crowd for its close-in ballistics and smooth shooting through a short-barreled, suppressed rifle. And what was once a weapon for the secret squirrel types has now gone high-profile with a new solicitation from U.S. Special Operations Command asking industry for options to outfit spec ops troops with a new personal defense weapon.
In a formal Request for Information, SOCOM is asking for options to equip its commandos with an M4A1-compatible upper receiver group that fires the .300 Blackout cartridge and configures the weapon into a short-barreled rifle no longer than 26 inches with the stock fully extended.
The whole PDW with the upper can't weigh any more than 5.5 pounds and has to have a collapsed or folded length of a tick over 17 inches.
Those dimensions will be tough to meet, firearms experts say, and combined with the requirement that the weapon be able to fire with the stock collapsed or folded narrows the current options significantly.
And, oh, the upper has to convert from a .300 BLK barrel to a 5.56 one in less than three minutes.
(Could a variation of the Honey Badger be the only real option out there? Ah, the sweet irony!)
Aside from the dimensions, weight and conversion time, the selection of the .300 BLK cartridge for the new kit is one of the first public acknowledgements of special operators' preference for the caliber in its close-quarters combat arsenal.
Developed about five years ago by the now Remington-owned Advanced Armament Corp. for SEAL Team 6 and Delta Force types who wanted a replacement of the MP-5 submachine gun, the .300 BLK is essentially a 7.62 bullet in a cut down 5.56 case. That gives it good short-range ballistics and allows operators to use the same magazines, lower receivers and bolts of standard-issue rifles but with a different barrel.
Because of the shortened case, the .300 BLK also performs better than 5.56 in rifles with extremely short barrels (under 9 inches) and when shooting with a suppressor, ammo experts say, which aligns with special operations troops' preference for suppressed rifles in close-in shootouts.
The SOCOM request states that companies have until April 10 to respond with their options.