CAUTION: Many States and localities regulate the use and/or possession of collapsible and folding stocks.
SIG's tele/folder has the largest butt pad, unless you go with an adapter and use the M4 stock you like.
2 of my 3 MCX stocks are SIGs and collapsible is a KES.
To function the MCX upper you must use either the Match Duo trigger or the Geissele trigger for the MCX. Parker Mountain Machine is proud to offer The PMM Sig Skeleton stock, these are factory MCX stocks that have had our proprietary lightening relief cuts machined out and refinished in a 8625 type 3 class 2 industry standard hard-coat. It features both an M16/AR-15 type charging handle and a left side charging handle.
Been waiting for years and it finally arrived; price went from $60 to $99 since fort posted on site though. It is YOUR responsibility to insure your use of this product is in compliance with all Federal, State and local laws and regulations.  The overall layout of the two rifles is similar.
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, First generation MCX variants have a forend made of aluminium with a KeyMod system to add accessories while second generation MCX variants have an M-LOK handguard. MCX Stock Adapter Kit gives you the ability to upgrade your rifle and install MCX folding stock assemblies (Note: This will not works with Collapsible stock / braces).
Completing the CAPTCHA proves you are a human and gives you temporary access to the web property. The SIG MCX-MR (Mid Range) is SIG Sauer's unsuccessful submission for the United States Army's Compact Semi-Automatic Sniper System (CSASS) program. I went ahead and put a Sig folding stock on it and it works like a champ. sig sauer, inc. mpx/mcx folding telescoping stock 1913 interface.
The MCX is available in rifle, carbine, short-barreled rifle, and pistol (generally considered as a compact carbine without buttstock) configurations..
Whereas a tactical application will need a rifle with good sights and a telescoping stock.
The barrel's profile is tapered at the crown to allow the installation of muzzle devices and direct-thread sound suppressors without the use of washers that degrade performance and allows the devices to self-centre on installation. This item came without installation instructions, however insulation was intuitive – I had to put blue Loctite on to keep it ‘tight’.  SIG Sauer is yet to deliver the 7.62×39mm configuration and has removed the calibre as an option in their official website.