XH Carbine Buffer (8.5 oz) w/.308 Rifle Buffer Spring - $140
If you have an extended (7¾" deep) receiver extension on your large-frame AR we recommend an XH carbine buffer and a .308 rifle buffer spring (#EA1095).
This includes VLTOR A5 tubes and the Magpul UBR Gen2 stock. Many .308 rifles come from the factory in this configuration - LMT, S&W, LaRue, POF, etc.
If you have any doubt please measure your current buffer and check the inside depth of your buffer tube. If your buffer is 3-1/4" long and your tube is 7¾" deep this is the best buffer/spring combo for your gun.
Note that all .308 rifle buffer springs are not created equal. We strongly encourage using the ArmaLite #EA1095 buffer spring listed here. Using other buffer springs is likely to cause reliability issues. We do not recommend using flat-wire springs under any circumstances.
DO NOT USE an XH Carbine Buffer in any large-frame gun with a standard AR-15 carbine buffer tube! Damage/injury/mayhem will result.
Please email us before ordering if you have any questions.
FCD REF5 - A5 Buffer Tube Kit - 7¾" - $70
Forward Controls Design RE5F Receiver Extension
- Extended Carbine Buffer Tube
- 7¾" Inside Length
- MILSPEC Diameter, 9-Position with 2 Extra Drain Holes
- Aircraft Grade 7075-T6 Aluminum
- Interior Coated with Dry Film Lubricant
- Made in USA
- Includes Nut and Lock Plate
- Use only with A5 Buffers for 5.56mm and other Small-Frame ARs
- Use with XH Carbine Buffer for .308/6.5 CM and other Large-Frame ARs
Note: We cannot guarantee proper function with subsonic ammo. There are significant differences in specifications among the various brands of ammo and firearms manufacturers. Some guns will run great with almost any ammo, other guns may not function reliably with any subsonics. This is all beyond our control.
Specifications are subject to change without notice.
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