ACOS Arms Bauska: A Straight-Pull .45 ACP Pistol Built for Suppressor Use

June 18, 2026
11:12 am

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https://youtu.be/PShTuEohocQ The Bauska pistol from ACOS Arms is a straight-pull bolt-action firearm chambered in .45 ACP, designed to deliver subsonic performance in a compact, lightweight package. Built around an 8.5-inch chrome-moly nitrided barrel threaded .578x28, the pistol uses Glock 21-pattern magazines and eliminates the weight of traditional AR-15 operating parts by relying on manual cycling. On the scale with an SBA3 brace attached, the gun weighs approximately 4.5 pounds, leaving room for accessories without becoming unwieldy. Pros Extremely lightweight and easy to accessorize Smooth, rotating bolt that is simple to operate Compatible with most AR-platform accessories Effective as a suppressor host due to manual operation Lower ammunition cost compared to subsonic .300 BLK Cons Castle nut left unstaked from the factory Handguard lacks a torque plate, risking long-term loosening Accuracy limited by .45 ACP ballistics and range ammo variability Current lower receiver omits a Picatinny rail section Specifications Barrel: 8.5-inch chrome-moly nitrided, threaded .578x28 Weight: ~4.5 lb with SBA3 brace Magazine: Glock 21 pattern Trigger options: one- or two-stage Bolt handle thread: 5/16x24 Reviewer commentary highlighted both the gun’s smooth action and its value as a budget-friendly suppressor host. “Very few guns are that satisfying,” the host noted after cycling the bolt. On accuracy testing at 200 yards, the host observed, “It’s not the most impressive in the world, but we are talking about .45 ACP which inherently is not a particularly accurate cartridge.” Despite minor fit-and-finish critiques, the overall verdict was positive: “As far as a glorified muffler host, this thing is absolutely fantastic and highly, highly recommended.”

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The Bauska pistol from ACOS Arms is a straight-pull bolt-action firearm chambered in .45 ACP, designed to deliver subsonic performance in a compact, lightweight package. Built around an 8.5-inch chrome-moly nitrided barrel threaded .578×28, the pistol uses Glock 21-pattern magazines and eliminates the weight of traditional AR-15 operating parts by relying on manual cycling. On the scale with an SBA3 brace attached, the gun weighs approximately 4.5 pounds, leaving room for accessories without becoming unwieldy.

Pros

Extremely lightweight and easy to accessorize
Smooth, rotating bolt that is simple to operate
Compatible with most AR-platform accessories
Effective as a suppressor host due to manual operation
Lower ammunition cost compared to subsonic .300 BLK

Cons

Castle nut left unstaked from the factory
Handguard lacks a torque plate, risking long-term loosening
Accuracy limited by .45 ACP ballistics and range ammo variability
Current lower receiver omits a Picatinny rail section

Specifications

Barrel: 8.5-inch chrome-moly nitrided, threaded .578×28
Weight: ~4.5 lb with SBA3 brace
Magazine: Glock 21 pattern
Trigger options: one- or two-stage
Bolt handle thread: 5/16×24

Reviewer commentary highlighted both the gun’s smooth action and its value as a budget-friendly suppressor host. “Very few guns are that satisfying,” the host noted after cycling the bolt. On accuracy testing at 200 yards, the host observed, “It’s not the most impressive in the world, but we are talking about .45 ACP which inherently is not a particularly accurate cartridge.” Despite minor fit-and-finish critiques, the overall verdict was positive: “As far as a glorified muffler host, this thing is absolutely fantastic and highly, highly recommended.”

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