3.4 Muzzle Devices & Handguard (EP9 Carbine)Updated 4 hours ago
WARNING: Always confirm that a muzzle device is appropriate for use with the designated caliber of the firearm. If you are not sure or do not have the capability to physically confirm this, consult a qualified gunsmith.
The Extar EP9 Carbine is uniquely designed to accommodate easy and efficient muzzle device work in an uncommonly sensible manner. Do not attempt to use “upper vise jaws” or any similar devices designed for other firearms. Simple and common hand tools are all that is required and all that should be used to prevent damage to your upper receiver.
Figure 14
3.4.1 Remove the factory thread protector first by firmly gripping the thread protector and then turning it to the left till it is removed.
NOTE: To reinstall our unique non-threaded thread protector, simply put the thread protector on with the tapered side toward the muzzle and then push it on with the palm of your hand (fig. 14). This thread protector will not walk off and thus requires no Loctite or O-ring.
3.4.2 Remove the handguard by removing the two retaining screws on the backside of the hand guard retainer and the one retaining screw in the front upper rail, using a Phillips head screwdriver. (fig. 15)
3.4.3 After all three screws have been completely removed, the hand guard may now be pulled firmly forward to release it from the barrel nut. Lower the handguard from the top rail and then pull straight off the rest of the way. (fig. 16)
3.4.4 For muzzle devices that require orientation or torquing, standard open-end wrenches should be used to perform required work. (fig. 17) For additional stability, the wrench flats on the barrel can be covered with heavy protective paper and lightly clamped in an appropriate area of a vise, but this is usually not necessary and wrenches are the preferred method to avoid damage. If a vise is used on the flats, tighten only enough to hold against rotation, as a powerful vise could easily deform the barrel bore.
3.4.5 Assemble in reverse order. Make sure to only hand tighten the handguard back on and do not use power tools.
Figure 15
Figure 16
Figure 17
← Previous: 3.3 Reassembly | Complete Owner’s Manual | Next: 4.1 Parts Identification →