AR-10, 308 AR/AR308, DPMS G2 Barrel Extensions
We frequently get inquiries from shooters looking for AR-10 Barrel Extensions. Of course if you have been following this site long enough you know that they probably are not looking for AR-10 barrel extensions but instead in most cases looking for DPMS LR-308 compatible 308 AR/AR308 barrel extensions. Furthermore if one has the skills to mate a barrel and barrel extension why limit themselves to Armalite AR-10 bolt carrier groups.
Barrel Extension Considerations
- Armalite AR-10 and DPMS Compatible Barrel Extensions are different. The require different bolts.
- The barrel extension dictates the bolt to be used with the carrier
- AR-10 can use a DPMS barrel with a DPMS barrel and barrel extension as long as a DPMS 308 bolt is used
- DPMS platform can use an AR-10 barrel and barrel extension as long as an AR-10 bolt is used
- Do not use the same bolt with more than one barrel. Every barrel extension/barrel combination requires it’s own dedicated bolt.
- Theoretically AR-10 and DPMS 308 Bolt Carriers are interchangeable as long as the bolt style matches the barrel extension
- DPMS G2 (DPMS GII) is not compatible with AR-10 or DPMS 308 barrel extensions. G2 is a different platform completely
Note: While above we state the interchangeability between AR-10 and DPMS platforms we feel it is bad practice and unnecessary to mix the brands.
Note: To date the only place we know to acquire an actual AR-10 barrel extension is from Armalite. DPMS is the standard most manufacturers have adopted. Be careful when a seller refers to AR-10. If compatibility isn’t clear and obvious contact the manufacturer or vendor.
WMD Guns NIB-X 308 AR Barrel Extension
WMD’s 308 AR Barrel Extension has been NiB-X coated to increase lubricity and provide for smooth locking and unlocking with the critical bolt interaface. Feed ramps are 45°. The entire barrel extension is polished.
M4-type barrel extension has NiB-X finish that aids in smooth locking and unlocking with the bolt, consistent feeding and helps prevent hang-ups. This high-tech coating lasts the life of the weapon, and won’t rub off, flake off, or gall. Helps dissipate heat for cooler operation, too. Precision machined from 8620 steel to USGI specifications with integral M4-type feed ramps and predrilled locator pin hole.
BAT Machine AR308 Barrel Extension
Precision barrel extension made for the AR-10 (DPMS style) rifle platforms. These extensions are completely machined in the hard condition to provide the most accurate extension possible. The BAT Machine AR308 Barrel Extension is machined 4140 chrome-moly steel barrel extensions help the custom rifle builder ensure a secure barrel fit for best alignment and accuracy. Heat treated for surface hardness to give years of reliable service. Available for M4 carbine extension with feed ramp cuts. AR-Style .308 extension fits the DPMS LR-308 and other .308s with the same thread pattern, plus it offers M4-style feed ramp cuts to ensure extra reliability in getting rounds from the magazine to the chamber. All models have pre-drilled locator pin hole.
SPECS: 4140 chrome-moly steel, in-the-white. AR-Style .308 –1.200″ O.D., .940″ I.D., w/M4-style feed ramps. Fits DPMS LR-308, Remington R-25, and other AR-Style .308 rifles with same receiver thread pattern.
Lilja Barrels .308 AR Barrel Extension
Adam Lilja dropped us a message to let us know Lilja Barrels is now offering a 308 barrel extension they make in-house. These are a top-quality 308AR barrel extensions made on CNC equipment with a single-point thread. Following heat treat we hard-turn the outside diameter and true the face and lugs for maximum concentricity and elimination of any distortion from heat treat. Custom AR builders can now use the same extensions they use on their finished drop-in barrels.
Miller Precision Arms 308 AR, AR308 Barrel Extension
Miller Precision Arms 308 AR, AR308 Barrel Extension features machined 4140 chrome moly steel barrel extensions help the custom rifle builder ensure a secure barrel fit for best alignment and accuracy.
- Heat treated for surface hardness to give years of reliable service.
- Available for M4 carbine extension with feed ramp cuts.
- AR-Style .308 extension fits the DPMS LR-308 and other .308s with the same thread pattern, plus it offers M4-style feed ramp cuts to ensure extra reliability in getting rounds from the magazine to the chamber.
- All models have pre-drilled locator pin hole and pin is included.