extractor groove

[ik′strak·tər ‚grüv]

(ordnance)

Groove machined in the base of a cartridge case, a short distance above the head, which receives the extractor of the breech mechanism and permits the case to be withdrawn by the extractor; used in automatic weapons, in preference to extractor rims (flanges) formed on the cartridge case base.

References in periodicals archive ?

Just behind the extractor hook is a pad on the extractor body that positions it and determines contact of the extractor groove with the cartridge.

The Seecamp Conversion: Louis Seecamp was a 1911 fan and advocate of double actions for carry. Here's how to work common problems with his conversion

The semi-rim rests in the extractor groove of the underlying round, and in order to move the top round forward, it has to push all the underlying rounds deeper into the magazine under all that magazine spring pressure.

SUPER-ACCURATE .38 SUPER LOADS: Whether pushing bullets slow or fast, the .38 Super can deliver outstanding accuracy

Cases can be formed from the .32 Long by removing the rim, cutting an extractor groove and sizing and trimming.

The French mas

All feeding must be from the magazine and the extractor claw rides in the case's extractor groove starting at the time the cartridge moves upward out of the magazine.

Small arms of the German World War II-era Fallschirmjager: part 3

Rim diameter is 0.407 inch and case body ahead of the extractor groove is 0.375 inch.

Winchester Model 1907 .351SL: one of our first self-loading centerfire rifles was a surprisingly potent blowback

All that remains now is to cut the extractor groove in the rear of the barrel.

Build a target grade rimfire AR-15: the cmmg .22 conversion is well known, but matthews made some modifications to it for maximum accuracy and reliability with .22 ammo

4 rimless cartridge requires small pawls to reach into the extractor groove remove the case.

Cal on doubles

Keep an eye out for that telltale bright, shiny ring in front of the extractor groove that indicates an incipient head separation.

The .250 Savage: well-mannered and accurate, this vintage quarter-bore hotshot still fulfills its deer/varmint dual role as well as ever

According to NAA, "Behind the neck, all case dimensions and configurations, including the extractor groove, rimless case, cartridge diameter and bolt-face engagement are identical to the .380 ACP.

Super charging the mighty Guardian

Check cases for any flaws such as a too-battered extractor groove and discard any that don't look right.

Caring for cases: treat your cases right, and they'll do the same for you. (Rifles & Reloading)

The Groove Smooth is located on the outside of the Chambered Reference and is used to identify the cylindrical runout of the re-sized brass and the trueness of the extractor groove, and also to ensure the groove is free of any defects or obstructions.

WHY YOU NEED THIS

A cartridge case may rupture into the extractor groove in extreme cases.

Working .22 rifles: providing good service for small, common repair jobs can help build your gunsmith business