300 Blackout Adapters

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We were the first company to produce the 300 Blackout Adapter for subsonic 220 grain ammunition. We offer that adapter and more for your shooting pleasure! Reasonable pricing and fast, low cost shipping. Our adapters are made from American steel by American workers on precision CNC machines in the United States to guarantee concentric to your host firearms barrel threads. From raw material to finishing, all work is done in house and we stand by our products.


Quantity Model- Manufacturer Product Image Item Name Price
93 AD-3B-030 XCALIBER FIREARMS 300 Blackout Adapter 5/8-24 to 1/2-28

300 Blackout Adapter 5/8-24 to 1/2-28

Our 300 Blackout Adapter is for barrels that are threaded 5/8-24. This adapter changes the thread pitch to 1/2-28 so you can use 9mm silencers when shooting 300 Blackout SUBSONIC ammo. This adapter should not be used when firing supersonic 300 Blackout. Knurled steel finished in black oxide. DO NOT USE YOUR PISTON SYSTEM WITH THIS ADAPTER AS IT WILL BREAK THE ADAPTER. You should used a fixed...
$49.99

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129 AD-3B-033 XCALIBER FIREARMS 300 Blackout Adapter 5/8-24 to 1/2-36

300 Blackout Adapter 5/8-24 to 1/2-36

Our 300 Blackout Adapter is for barrels that are threaded 5/8-24. This adapter changes the thread pitch to 1/2-36 so you can use 9mm silencers when shooting 300 Blackout SUBSONIC ammo. This adapter should not be used when firing supersonic 300 Blackout. Knurled steel finished in black oxide. DO NOT USE YOUR PISTON SYSTEM WITH THIS ADAPTER AS IT WILL BREAK THE ADAPTER. You should used a fixed...
$49.99

... more info

11 AD-3B-031 XCALIBER FIREARMS 300 Blackout Adapter in 45ACP 5/8-24 to .578-28

300 Blackout Adapter in 45ACP 5/8-24 to .578-28

Our 300 Blackout Adapter is for barrels that are threaded 5/8-24. This adapter changes the thread pitch to .578-28 so you can use 45ACP silencers when shooting 300 Blackout SUBSONIC ammo. This adapter should not be used when firing supersonic 300 Blackout. Knurled steel finished in black oxide. DO NOT USE YOUR PISTON SYSTEM WITH THIS ADAPTER AS IT WILL BREAK THE ADAPTER. You should used a fixed...
$49.99

... more info

141 AD-3B-032 XCALIBER FIREARMS 300 Blackout Adapter in 45ACP 5/8-24 to M16X1LH

300 Blackout Adapter in 45ACP 5/8-24 to M16X1LH

Our 300 Blackout Adapter is for barrels that are threaded 5/8-24. This adapter changes the thread pitch to M16X1 left hand threaded so you can use your 45ACP silencers when shooting 300 Blackout SUBSONIC ammo. This adapter should not be used when firing supersonic 300 Blackout. Knurled steel finished in black oxide. DO NOT USE YOUR PISTON SYSTEM WITH THIS ADAPTER AS IT WILL BREAK THE ADAPTER. You...
$49.99

... more info