Introduction

N.B. As of November 2019, there is now a more comprehensive article about L119A2 parts and accessories.

The pic below – from The Sun newspaper in May 2016 – was the one which absolutely confirmed that the L119A2 was in use with UKSF. The pic is from Exercise Winchester Accord.

13161773_718926498249978_5493704859160600650_o
 photo 11f014b9-3fc1-45c9-8eb2-1e42c0946981_zpsusfimk87.jpg

The following images are legacy screenshots from Colt Canada’s website, which were used at the time to cross-reference with the Winchester Accord pic, in order to better understand the parts composition of the L119A2.

Needless to say, additional information has come to light in the past few years.

 photo Screen Shot 2016-05-12 at 16.20.53_zpscrvrq2z7.png
 photo Screen Shot 2016-05-12 at 16.21.17_zpsimx3pb6t.png

Colt Canada’s website has also been updated:

L119A2
97EF8173-AE57-4C31-A7F6-C525149C8D74It’s been observed that there are two distinct variants of the L119A2.

They are popularly defined by their uppers, although the differences between the two concern the kit-out of the lower as well:

  1. “IUR” – Partial RIS; available in 10” and 15.7” barrel lengths
  2. “Alternative IUR” – Full RIS; 10” barrel length only

Monolithic Design

The L119A2 exhibits a monolithic upper, meaning that the rail and upper receiver are conjoined in one continuous unit. It is referred to as IUR – which means Integrated Upper Receiver.

In 2016, I pointed out that  LMT owns the patent on monolithic uppers and that they successfully prevented Mega Arms from marketing their own one-piece upper.

It later became apparent that Colt Canada had officially licensed the monolithic upper receiver design from LMT, as evidenced by the US Patent number shown on the Partial RIS ‘Alternative IUR’ L119A2.

See the patent PDF here.

2435534B-4B57-41AC-8B1B-7A60F1B1072E

Common Features – Partial RIS “IUR” and Full RIS “Alternative IUR”

The following basic package is thought to be shared by both the Partial RIS “IUR” and the Full RIS “Alternative IUR” versions of the L119A2:

  • Magpul CTR stock
  • Original Ergo grip (not Ergo 2)
  • Geissele trigger group
  • Colt Canada standard trigger guard
  • Colt Canada ambi selector group
  • Various Colt Canada ancillaries including BUIS (both folding and fixed), QD sling swivel, sling mount and grenade adaptor attachment

Partial RIS “IUR” Features

  • 10″ and 15.7″ barrel lengths (not 10.5″ and 16″)
  • Surefire FH556-216a flash hider
  • Colt Canada ambi mag catch
  • Colt Canada ambi charging handle (often has extended left-side latch cut down)
  • Magpul ASAP
  • Grenade lug tapped for barrel nut anti-rotation bolt
  • Plug removed from Original Ergo grip

41181774_318884032019424_92784702481498112_n

Full RIS “Alternative IUR” Features

  • 10″ barrel length only (not 10.5″)
  • Birdcage flash hider
  • Standard Colt Canada mag catch
  • Standard Colt Canada charging handle
  • Magpul ASAP-QD
  • Grenade lug not tapped for barrel nut anti-rotation bolt
  • Plug often retained in Original Ergo grip

img_6449

Upper Receiver Serial Number

While the Full RIS ‘Alternative IUR’ exhibits the LMT patent number, the Partial RIS ‘IUR’ is said to be shipped blank. It apparently is subsequently engraved with the lower’s serial number by UKSF armourers.

The style of engraving is said to vary, with this blog able to verify white laser engraving.

The serial format is a concatenation of:

Year of production (2 digits) + production unit (5 digits) + country code (GB)

e.g.

1500991GB

img_0826
NOT A REFERENCE PIC – HAO replica L119A2 receiver set with an example upper receiver serial number, matching the stamped serial on the lower

NATO Stock Number – NSN

The L119A2 exhibits a NATO Stock Number – or NSN – on the right hand side of the mag well:

8F01AAA6-D7BF-42D6-8E85-B4026D98434C

In the above pic we can just about make out an NSN which exhibits this string:

1005-20-008-7498

Other pics confirm this number.

According to the table below which was posted on Facebook, the string ending 98 corresponds with the 15.7” model.

However, at this date I would be inclined to use the 98 number on a replica lower for either length upper. This is because, so far, I have only seen lowers with NSN markings ending 98 – regardless of upper.

The 99 lower may well be out there, or the NSN could have been created and never used. Time will tell (or we may never know).

3B0F11BA-880F-4A3B-82CB-3CFF51CFAAFF

Also note that 16” (as related above) is an approximation, not the defined length of the rifle length IUR’s barrel (which is 15.7″).

There is no documentary evidence that I know of which suggests a different length for the SBR version of the IUR, so this is always taken to be 10″.

Custom and Practice

Charging Handle

In the wild, some L119A2 charging handles have had the existing latches cut down e.g. Newcastle pics; Obi Wan Nairobi pics.

img_0817

More articles relating to the L119A2:

  • The Comprehensive UKSF (SAS/SBS) L119A2 Parts and Accessories List
  • 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

Illustrative Pics

F2B385BE-EABE-42DA-AB77-203D1122DBB3

img_6228-1img_6228

07BB883E-1268-43BB-B1D7-49E1227AAD7A8E16627E-0ABE-4382-8BD0-4C72531AC4FA8B98A123-776E-4A5D-9EC1-4FF078093FF099329C6A-2111-454C-89AB-6643D335B001F0A0BD34-126E-4BFE-B16D-22A2341CB85208113D5D-27A0-4CD0-8E15-754B905F32512DC7EA59-10C7-4DCD-A573-71E1BFB50A00

0F888ED2-12FD-4045-9E2B-5D83C3194D92

13116376_718926488249979_6811576474849984425_o13198547_718926234916671_8823625603748455307_o

partial RIS

0_SGP_NEC_111218POLICE11seqnJPG0_SGP_NEC_111218POLICE10seqnJPG

img_8654-1hirez2hirez2img_9833img_9832

Note: November 2019

Since May 2016 when this article was originally published, I’ve done my best to keep it refreshed with L119A2 updates. I’ve learned about these through my own research and from the research of friends (often with legit contacts).

However, since most enthusiasts aren’t particularly interested in the Full RIS ‘Alternative IUR’, this article has for the most part been superseded by:

The Comprehensive UKSF (SAS/SBS) L119A2 Parts and Accessories List

Credits

Big thanks to Jay Taranis for his help in the earliest stages of this article’s evolution.

Follow the Reptile House on Facebook and Instagram