A fantastic pic was posted today on @btl_ltw’s IG, depicting a UKSF SIG MCX similar to a LVAW (Low-Visibility Assault Weapon) or “Black Mamba“, nestled with an L119A2.
It’s been known for some time that the MCX has been in use with both CAG (and other USSOF elements) and UKSF; but I’ve no idea what the UKSF designation for it is – or how the UKSF build differs to the LVAW (which is a US designation, not UK). It’s likely there are multiple configurations and variations, so right now it’s hard to say.
The interesting thing about the MCX family is that it chambers both 556 NATO and 300 AAC Black Out rounds (or 300 BLK).
That’s significant because 300 BLK delivers similar properties (e.g. stopping power) to a Soviet 7.62×39 cartridge but in 7.62×35 and – crucially – uses AR15 type magazines at their normal capacity.
USSOCOM’s requisition for 300 BLK dates back to March 2017.
In July 2017 the UK MOD issued a five year tender for the supply of 300 BLK. However, the document stated that the ammunition was already in use – possibly predating SOCOM’s use:
The Authority has a potential requirement to procure 7 62mm x 35 Ammunition. The ammunition will replace the 7 62mm x 35 ammunition currently in service and will undertake safety testing.
More articles, relating to the L119A2:
- The Comprehensive UKSF (SAS/SBS) L119A2 Parts and Accessories List
- The original L119A2 primer, here
- GG&G AR15 vertical fore-grip in use here
- Magpul QDM and ASAP QD in use here
- 15.7″ L119A2 upper in use here
- Surefire FA556SA Suppressor here
- GG&G Aimpoint T1 mount in use here
- Magpul MS3 sling in use here
- Magpul ACS stock in use here
- Colt Canada parts – as used on the L119A2 – here
- Manta Very Low Profile Rail Covers as used on the L119A2 here
- UKSF Newcastle raid pics part 1
- UKSF Newcastle raid pics part 2
- UKSF Nairobi Kenya incident L119A2 parts breakdown here
- UKSF Belize ‘Jungle Set-up’ L119A2 parts breakdown here
- Confirmation bias (and the HSP Thorntail offset light mount) here
- UKSF Ecosystem: S&S Precision Sling Clip – Old Gen – here
- Inforce WML-type lights in use here