HOME > AR-9 > AR-9 LOWER PARTS >

AR-9 9MM BUFFER 4" EXTENDED LENGTH - 8oz
AR-9 9MM BUFFER 4" EXTENDED LENGTH - 8oz
 
MSRP: $24.00
Our Price: $19.99

Stock Status: In Stock


Product Code: MAS00118207
Qty:

DESCRIPTION
 
AR-9 9MM BUFFER 4" EXTENDED LENGTH - 8oz

- 8 oz
- Made of steel
- Extended 4" Length. (A standard buffer measures 3.25")
- Will work in both Mil-Spec and Commercial tubes.
- Includes a mil-spec bumper
- Phosphate Finish

The added length helps prevent breakage of the bolt catch.

RELATED ITEMS
16" 9MM AR-15 BARRELED UPPER - MAS DEFENSE NERO 15" M-LOK RAIL 8.3" 9MM AR-15 BARRELED UPPER - MAS DEFENSE NERO 7.25" M-LOK RAIL AR-9 9MM BOLT CARRIER GROUP - GLOCK AND COLT BCG - MELONITE NITRIDE 5.25" 9MM AR-15 BARRELED UPPER - MAS DEFENSE NERO 4.2" M-LOK RAIL
SALE PRICE: $244.99
SALE PRICE: $224.99
SALE PRICE: $109.99
SALE PRICE: $219.99
16" 9MM AR-15 BARRELED UPPER - MAS DEFENSE NERO 15" M-LOK RAIL 8" 9MM BARRELED UPPER - MAS NERO 7.25" M-LOK RAIL AR-9 9MM BOLT CARRIER GROUP GLOCK AND COLT BCG - MELONITE NITRIDE 5.25" 9MM AR-15 BARRELED UPPER - MAS DEFENSE NERO 4.2" M-LOK RAIL

Average Rating: Average Rating: 5 of 5 5 of 5 Total Reviews: 127 CLICK HERE TO WRITE A REVIEW »

  0 of 0 people found the following review helpful:
 
5 of 5 8oz AR9 Buffer July 12, 2026
: Eric  
My buffer was shipped quickly and arrived within a week. Perfect upgrade for my rifle after adding a suppressor.

Was this review helpful to you?

  0 of 0 people found the following review helpful:
 
5 of 5 May 14, 2026
: Dexter Hardin from Lumberton, NC United States  
Nice product..

Was this review helpful to you?

  0 of 0 people found the following review helpful:
 
5 of 5 Perfect weighted extended AR-9 buffer May 1, 2026
: Ronald Williamson from Tuttle, OK United States  
Great product at an awesome price! Thanks MAS Defense for always staying one step ahead!

Was this review helpful to you?

  0 of 0 people found the following review helpful:
 
5 of 5 AR-9 Buffer February 11, 2026
: from Florence, MT United States  
Haven't shot it yet but looks to be what I need.  Good packaging.

Was this review helpful to you?

  0 of 0 people found the following review helpful:
 
5 of 5 Works perfectly January 17, 2026
: Ernest Lay from Eatonville, WA United States  
Very smooth and flawless in my 9mm!

Was this review helpful to you?

View All Customer Reviews


MAS DEFENSE 9MM 416R STAINLESS SIG P320 COMPACT / CARRY BARREL - MATTE GOLD PVD (TiN) - THREADED
8.3" AR-9 / AR-15 9MM 1x10 4150 CrMoV MELONITE NITRIDE BARREL
MAS DEFENSE 9MM 416R STAINLESS SIG P320 COMPACT / CARRY BARREL - MATTE GOLD PVD (TiN) - THREADED
8.3" AR-9 / AR-15 9MM 1x10 4150 CrMoV MELONITE NITRIDE BARREL
$99.99
$69.99