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What does MGB stand for?

MGB stands for Match Grade Barrel (ammunition)

This definition appears somewhat frequently and is found in the following Acronym Finder categories:

  • Business, finance, etc.

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Other Resources:
We have 74 other meanings of MGB in our Acronym Attic

Samples in periodicals archive:

Both models feature a 416R forged stainless steel match grade barrel, XS Express white post fixed white post night rear sight and white dot front sight and seven-round magazine.
223 Remington caliber, the FAL 15 features a "flat top" accurized Picatinny receiver, 10-round magazine, 20-inch stainless steel match grade barrel, hand-fitted Match grade chamber, 1:8-inch twist rate, plain muzzle with recessed target crown, black AR-style grip and oiled Walnut stock.
All the usual upgrades are in place: beavertail, extended thumb safely, Novak sights, match grade barrel and fitted slide and frame.
The secret to any good rifle is a good barrel, and Cooper uses lead lapped match grade barrels from Wilson Arms.