barrel extension

barrel extension

[′bar·əl ik′sten·shən]
(ordnance)
Metal projection fixed to the rear of the barrel in certain automatic guns; extends backward and holds the breech locked against the gas pressure in the chamber when the gun is fired.
References in periodicals archive ?
When this plate slips far enough to the rear, it enables the locking bolt that locks the bolt to the barrel extension to drop, freeing the bolt to join the action bars in its trip to the back of the receiver.
About the extension, Ruger Project Manager, Matt Wilson, said, "On the inside, the barrel extension is just like any other AR rifle.
While the firing mechanism was quite different, the little-known 1901 patent contained the following features found also in the water-cooled Model 1917 (actually designed in 1910): a rising breech lock to lock the action, an accelerator to speed the bolt's rearward travel, a coil recoil spring, a claw extractor, a separate barrel extension, and a belt feed lever.
This, of course, does not affect the strength, ince the action follows the typical pattern of the lug rising up into the barrel extension, making for solid lockup.
If replacing an M2 machine gun pin for a couple of bucks can save replacing a $500 barrel extension, you can bet the bean-counters sit up and take notice.
As the bolt carrier is violently pushed to the rear, the process of unlocking the bolt's lugs from the barrel extension takes place, and the extractor claw yanks the spent brass from the chamber.
Among the revolutionary new products conceived by Broadsword Group's designers is the Relia-Bolt, a drop-in bolt assembly that prevents jamming in the bolt to barrel extension.
The receiver also features an integrated scope rail, which is aligned with an integrated barrel extension for greater accuracy.
A feature of the coring head is the interchangeable cutters (103 mm internal diameter) and barrel extension (Fig.
Introduced in late 1944, it consisted of a barrel extension with a curve of ninety degrees fitted to a Sturmgewehr 44 and sighted by a periscope using mirrors fitted to the stock.