F4 Defense SF-10, Small Frame AR10 – Review with Field Experience

By JJ Sutton

U.S.A. –-(Ammoland.com)- F4 Defense was great to work with. I got a complete Small Frame AR10 build into my hands early in last year (2019) when things were at their craziest (SHOT Show and the trade show season). I planned a hunting and hard-working review.

The rifle I received is NOT a production rifle – it was built from available parts as a one-off model and in the 7mm-08 caliber. I like it like that, sometimes it can really show you if the receiver sets are going to function under mixed tolerances.

Looking at it closely, the F4 Receiver Set is quality work, solid machining. I like the lines, their own interpretation and mark leave no doubt this is their product. Anodizing is a quality finish, this receiver is set up as an ambi receiver, the magwell has a no wobble, not too tight, and a clean smooth fit for Magpul magazines that I use.

Setting the F4 Defense Small Frame Receivers side by side to the older SI-Defense (now Falkor …Read the Rest

Source:: AmmoLand