The FX-9 upholds Xtreme reliability with a wide range of ammo including many hollow point designs for self defense and full metal jacket. We do not recommend the use of non jacketed ammunition as unprotected lead can cause fouling and buildups that plated and jacketed bullets do not. Do not use aluminum case ammunition or the brand Zinc Point ammunition it may cause damage to your FX-9 and void your warranty!In addition to being reliable and affordable the FX-9 was designed to be completely modular. Outfit it with any Freedom Ordnance barrel length and customize it with a nearly endless amount of AR-15 accessories. Also you can create just about any configuration you need for your next mission. Made in the USA this is freedom to the extreme. The FX-9 sling models feature a QD receiver end plate designed with quarter-turn rotational over travel stops. Heavy-duty 1.5 adjustable polyester sling with an adjustable inner length of 42-58. The FX-9 sling models have a faux suppressor and a foam buffer tube cover. Because this model is braceless it does not fall under the NFA guidelines.