Upper Parts
Upper parts are what keep your AR cycling. ACME makes low profile gas blocks, stainless gas tubes, roll pins and mil-spec and ambidextrous charging handles for AR-15 and AR-308 in the USA. We also carry Geissele, BCM, Strike Industries, Odin Works, Seekins Precision and CMMG 22LR conversion kits.
Gas tube length guide
| Gas tube | Gas system | Typical barrel |
|---|---|---|
| Pistol | Pistol | 7.5" to 10.5" |
| Carbine | Carbine | 11.5" to 16" |
| Mid-length | Mid-length | 14.5" to 18" |
| Rifle | Rifle | 18" to 24" |
How to choose a gas block
- Journal diameter: Match the gas block to your barrel's journal: .625", .750", .875" or .936".
- Fixed or adjustable: A fixed block is simple and reliable. An adjustable block lets you tune gas for a suppressor or softer-shooting loads.
- Low profile: Needed to fit under a free float handguard like our Hive handguards.
Questions
Do I need an ambidextrous charging handle?
Not required, but it helps left-handed shooters and anyone running a scope, since you can work it from either side.
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SI Billet Ultimate Dust Cover-223 Blue
Strike Industries
Price: $30.95Introducing the next iteration of our Ultimate Dust Cover Line... Billet UDC. Featuring our quick detach mechanism that allows you to install or remove the dust cover in under 10 Seconds. It also...Price: $30.95 -
SI Billet Ultimate Dust Cover-223 FDE
Strike Industries
Price: $30.95Introducing the next iteration of our Ultimate Dust Cover Line... Billet UDC. Featuring our quick detach mechanism that allows you to install or remove the dust cover in under 10 Seconds. It also...Price: $30.95 -
SI Billet Ultimate Dust Cover-223 Red
Strike Industries
Price: $30.95Introducing the next iteration of our Ultimate Dust Cover Line... Billet UDC. Featuring our quick detach mechanism that allows you to install or remove the dust cover in under 10 Seconds. It also...Price: $30.95Qty in Cart: 0Quantity:Price:Price: $30.95Subtotal: -
.750 Low Profile Adjustable Gas Block
ACME Machine
Price: $29.99Lets You Tailor Extraction & Ejection To Individual Loads Lightweight, steel gas block features an adjustable gas port that lets you tune the amount of gas for reliable extraction and ejection to...Price: $29.99 -
AR-15 Ambidextrous Charging Handle Assembly Aluminum
ACME Machine
MSRP: $39.99Price: $29.99The ACME ambidextrous charging handle is truly revolutionary in design & function. From rapid palm “blading” or finger thumb charges of the weapon, the motion is fluid & fast from either strong or...MSRP: $39.99Price: $29.99Qty in Cart: 0Quantity:Price:MSRP: $39.99Price: $29.99Subtotal: -
AR-308 Charging Handle Assembly Mil-Spec Aluminum Matte
ACME Machine
MSRP: $39.99Price: $29.99Replacement component for the AR-308 that are made to strict military specifications. These high quality components will provide excellent fit and reliable function in your AR series platforms. These...MSRP: $39.99Price: $29.99 -
CLEARANCE
AR15 Steel Barrel Nut
ACME Machine
Price: $29.99Original factory parts to replace barrel nut on your free-float forearm. Barrel nut is compatible with any standard AR-15 or M16 receiver. Made of steel.Price: $29.99Qty in Cart: 0Quantity:Price:Price: $29.99Subtotal: -
NEW
Slim Flash Can 49/64-20
ACME Machine
MSRP: $34.99Price: $29.99Solid T6 Aluminum Body 49/64-20 Thread Pushes Flash Forward 1.245" OD 3.25 OALMSRP: $34.99Price: $29.99Qty in Cart: 0Quantity:Price:MSRP: $34.99Price: $29.99Subtotal: -
AR-15 Charging Handle Assembly Mil-Spec Aluminum Matte
ACME Machine
MSRP: $29.99Price: $27.99Replacement component for the AR-15 that are made to strict military specifications. These high quality components will provide excellent fit and reliable function in your AR series platforms. These...MSRP: $29.99Price: $27.99 -
NEW
Flash Can 1/2x28
ACME Machine
MSRP: $30.00Price: $24.99Solid T6 Aluminum Body 1/2x28 Thread Pushes Flash Forward Great For Use On AR15 PistolsMSRP: $30.00Price: $24.99 -
NEW
Flash Can 1/2x36
ACME Machine
MSRP: $30.00Price: $24.99Solid T6 Aluminum Body 1/2x36 Thread Pushes Flash Forward Great For Use On AR15 PistolsMSRP: $30.00Price: $24.99 -
NEW
Flash Can 5/8x24
ACME Machine
MSRP: $30.00Price: $24.99Solid T6 Aluminum Body 5/8x24 Thread Pushes Flash Forward Great For Use On AR15 PistolsMSRP: $30.00Price: $24.99 -
Low Profile Micro Gas Block .750 and Carbine Length Gas Tube
ACME Machine
Price: $24.99This is our standard AR-15 Micro Gas Block. Designed with the minimum profile to fit under nearly any quad rail system, it snugly fits standard .750 diameter barrels. Includes Carbine Length Gas Tube...Price: $24.99 -
Low Profile Micro Gas Block .936
ACME Machine
Price: $24.99This is our standard AR-15 Micro Gas Block. Designed with the minimum profile to fit under nearly any quad rail system, it snugly fits .936 diameter barrels. Features: Mil-Spec dimensions .936...Price: $24.99 -
NEW
Slim Flash Can 1/2x28
ACME Machine
MSRP: $30.00Price: $24.99Solid T6 Aluminum Body 1/2x28 Thread Pushes Flash Forward Great For Use On AR15 Pistols 1.245" OD 3.25 OALMSRP: $30.00Price: $24.99Qty in Cart: 0Quantity:Price:MSRP: $30.00Price: $24.99Subtotal: -
NEW
Slim Flash Can 5/8x24
ACME Machine
MSRP: $30.00Price: $24.99Solid T6 Aluminum Body 5/8x24 Thread Pushes Flash Forward Great For Use On AR15 PistolsMSRP: $30.00Price: $24.99Qty in Cart: 0Quantity:Price:MSRP: $30.00Price: $24.99Subtotal: -
Low Profile Micro Gas Block .750
ACME Machine
MSRP: $29.99Price: $19.99This is our standard AR-15 Micro Gas Block. Designed with the minimum profile to fit under nearly any quad rail system, it snugly fits standard .750 diameter barrels. Features: Mil-Spec dimensions ...MSRP: $29.99Price: $19.99 -
Low Profile Micro Gas Block .875
ACME Machine
Price: $19.99This is our standard AR-15 Micro Gas Block. Designed with the minimum profile to fit under nearly any quad rail system, it snugly fits .875 diameter barrels. Features: Mil-Spec dimensions .875...Price: $19.99 -
Strike Forward Assist - Black
Strike Industries
Price: $19.95The New Strike forward assist is the latest addition to the Strike Industries line of performance AR parts. The Forward Assist Plunger is made of lightweight aluminum for those looking to retain the...Price: $19.95Qty in Cart: 0Quantity:Price:Price: $19.95Subtotal: -
Strike Forward Assist - Blue
Strike Industries
Price: $19.95The New Strike forward assist is the latest addition to the Strike Industries line of performance AR parts. The Forward Assist Plunger is made of lightweight aluminum for those looking to retain the...Price: $19.95