Manual

The AC4 Pneumatic Recoil Buffer is owned,
manufactured, and distributed by
Olympic Arms, Inc. US Patent #6,668,478.
The AC4 Pneumatic Recoil Buffer is owned,
This model of AC4 Pneumatic Recoil Buffer is not adjustable. It has been designed for AR-15 rifl es
and carbines that have full length receiver extension tubes (i.e. A2 buttstocks, non-stubby ACE
stocks). It is very important to note that the AC4 does not work in collapsible stocks because the
receiver extension tube is too short.
The label on the non-adjustable AC4 will specify that the buffer is for either “5.56 / .223 AR Rifl es”
or “Pistol Caliber AR Rifl es”. The AC4 must be installed facing a specifi c direction for the different
calibers (see other side for installation instructions).
If using the AC4 with .223 Remington or 5.56 NATO then install the AC4 with the wide end going in
fi rst. Install the AC4 with the narrow end fi rst if you are using it with our pistol cal models (9mm,
10mm, 40 S&W, 45 ACP). Improper installation will void the warranty.
•• Warning! ••
Take special care when installing or removing any type of recoil buffer system. Recoil
buffer systems, whether spring or pneumatic, operate under sprung forces which can pose a
danger if allowed to be launched from the receiver extension tube. Be sure to aim the lower
receiver in a direction where, if the recoil buffer system were to be accidentally launched, it
would not cause damage to property or injury to other people.
•• General Maintenance ••
The AC4 is designed to be maintenance free, however, lifespan of this product can be
increased with periodic cleaning when maintaining your AR-15. We recommend wiping down
the piston shaft and lightly lubricating it. Do not use solvents or corrosives as they will cause
damage to the AC4 and void the warranty.
624 Old Pacifi c Hwy SE / Olympia, WA 98513
Tf: (800) 228 - 3471 / Fx: (360) 491 - 3447
•• www.olyarms.com ••
When using with .223/5.56 we recommend that you install the included band onto the wide end of
the AC4 before insertion into the receiver extension tube. The rubber band will help to prevent slop
and assist in the smooth operation of the AC4. DO NOT USE THE BAND WITH PISTOL CAL.