On SB Tactical’s website they show their latest brace coming out. The FS1913 brace is for the SIG Rattler however it is much more than that. It is designed to attach to any pistol or firearm with a 1913 picatinny rail at the back of the receiver. This means it will work with the SIG MPX, SIG MCX, SIG Rattler, Rock River LAR-PDS, etc.
You may be asking yourself “another SIG Brace, who cares?”. SIG had a folding brace which was actually a folding hinge with an adapter for an AR pistol buffer tube to attach a regular AR Pistol style brace. Then SIG came out with a collapsing brace for the MPX and MCX.
While both of these brace styles work as intended, they have a a minor flaw. They take up too much space. The old folding brace uses an AR pistol buffer tube which is works for attaching the brace but adds too much thickness when folded. The collapsing brace does not have that problem but when collapsed it adds additional length to the weapon.
The SIG Rattler, MCX, MPX have a minimalistic side folding stock that barely adds any length to the back of the weapon and is very narrow.
The closest narrow brace is actually SB Tactical’s SBT5 MP5 folding brace.
In fact I modified an SBT5 brace and attached it to the hinge of the MPX.
Why would I want a thin folding brace? So it can more easily fit in in a backpack. If you recall, the SIG Rattler was designed with the minimalistic folding stock and rumored that it was designed to be carried in a backpack but must be easy to draw and fire folded. Well the FS1913 will give you that same look and function but maintain your Rattler as a pistol.
As I mentioned earlier, the FS1913 is much more than a SIG pistol brace. Since it can attach to a 1913 picatinny rail there are other firearms out there that this will work on.
Earlier this year some people have made a picatinny end cap for the MP5K and clones.
With that adapter end cap and the FS1913 you will have a very minimalistic folding brace that folds to the left. The FS1913 will be available in September and will retail for $249.95. Go to their website for more information.