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Gas Blocks

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Choosing the right gas blocks

At Western Sport, we carry gas blocks options that cover the range of applications our customers actually use — range training, home defense, duty use, and competition. Our staff can help you narrow down the options based on what you are actually trying to accomplish.

We do not carry everything — we carry what works. If you ask us why we stock one product over another, we can give you a real answer. If something we carry has a known issue or a better alternative, we will tell you.

Order gas blocks online at Western Sport and they ship straight to your door, no FFL needed. We have been a licensed FFL/SOT dealer since 2007, and everything we sell carries the full manufacturer warranty. Not sure what fits your build? Send us a message before you order.

A gas block meters how much propellant gas leaves the barrel and drives the bolt carrier. Get it wrong and the rifle either short-strokes or beats itself up; get it right — especially with an adjustable block — and the same rifle runs softer, cleaner and more reliably with or without a suppressor. Western Sport carries fixed low-profile blocks and adjustable blocks across the common journal sizes. They are parts, not firearms, so you order online and they ship to your door.

  • Journal size is the first measurement: .625″ suits pencil profiles, .750″ fits most standard AR-15 barrels, and .875″ and .936″ cover heavy profiles and many AR-10 / LR-308 barrels. Measure at the gas port shoulder.
  • Clamp-on vs set screw: a clamp-on block grips the barrel all the way around and needs no dimple; a set-screw block sits lower under a slim handguard and usually wants a dimpled barrel.
  • Fixed vs adjustable: a fixed low-profile block is simplest and lightest. An adjustable block lets you tune gas for a suppressor, a short barrel or a specific load.
  • Bleed-off vs restrictor: restrictor-style adjustables choke flow inside the block. Superlative Arms blocks instead vent the surplus forward out of the block, which keeps fouling out of the adjustment passage.
  • Suppressed shooters: a can raises back pressure, so an adjustable block is the usual fix for over-gassing — tune until brass lands around 3 to 4 o’clock with the suppressor on.
  • Ordering: gas blocks ship to your door, no FFL transfer needed.

How to tune an adjustable gas block

Close the adjustment screw until the rifle will not cycle, then open it in small increments, firing a round or two at each step, until the bolt locks back reliably on an empty magazine and brass ejects consistently. Tune with the configuration you actually shoot — if the rifle lives with a suppressor on it, tune it suppressed and accept slightly livelier ejection when the can comes off. Write the setting down; it is easy to lose after a cleaning.

Brands we stock

Superlative Arms for patented bleed-off adjustable blocks and piston conversions, plus low-profile blocks from the major AR builders. If you are also shopping a can, our suppressors are NFA items — we hold the SOT and file your Form 4, with no filing fee on items bought from us.

How ordering works

Add the block to your cart and check out; it ships to your address. Credova financing is available at checkout, and we price match authorized dealers on identical items that are in stock and ready to ship. Not sure which journal size your barrel takes? Send us a message with the barrel maker and profile and we will tell you.