CMMG's Mk9 pistol-caliber platform is the latest design in the company's lineup to incorporate the Radial Delayed Blowback system. These Mk9 platforms are available in Banshee and Resolute options.

But H&K designers delayed or retarded the gun's blowback action with a gas system. The PSP's barrel is ported just forward of the case mouth seat in the bottom of the fluted chamber.

Radial Delayed Blowback also reduces bolt velocity, ... U.S. Pat. No. 9952011) in order to allow the Last-Round Bolt Hold Open feature to be compatible with the 10mm and other pistol cartridges.

CMMG recently unveiled a new line of super-compact AR15 style pistols and short-barreled rifles chambered in FN 5.7x28mm. ... we were excited to pair the 5.7 with our Radial Delayed Blowback system.

Even the .32 ACP version of the pistol, the P7K3, which doesn’t use the gas-delayed blowback system, is complex, as a hydraulic recoil buffer is installed in place of the gas piston.

Ditching the handgun cartridge and running more powerful rifle ammunition called for an updated operating system. The MP5's roller lock, delayed blowback system is fine for pistol caliber loads ...

Like the SIG 710-3, H&K’s own roller-delayed blowback machine gun, the HK21 only saw limited adoption, though it did serve in an extremely limited capacity in the Bundeswehr as the G8.

The CMMG MkG Guard is an AR15-style rifle for chambered in .45 ACP and features a Radial Delayed Blowback operating system that works to harness the strong recoil impulse of .45 ACP.

The design by General John J. Thompson was complicated yet reliable. It utilized the Blish Lock to delay the opening of the bolt when fired which made the M1928 Thompson a delayed blowback firearm.