I recently got an email from a reader who had scanned the EM-2 manual section from the back of Thomas Dugelby’s EM2 Concept and Design and sent it to me. I thanked him (although I can’t post a scan from a copyrighted book like that), but mentioned that I already have a scan of the manual itself. I went to grab the link, and realized only then that I never actually published that manual, on account of having somehow missed several pages when I scanned it. Still, better to have most of it available than none, so here it is (less pages 4/5, 22/23, and 28/29). The full material is available in Dugelby’s book, although it is out of print and difficult and pricey to find.
For those not familiar, the EM-2 was actually very briefly adopted as the new standard British Army rifle (in .280 Enfield caliber) – Rifle, No. 9 Mk. I in 1951, and then un-adopted before production could begin in a diplomatic acquiescence to the US insistence on NATO use of the 7.62x51mm cartridge. The design is basically a long-stroke gas piston with a bolt and locking mechanism copied from the German G41(W) and G43/K43 rifles. Similar to the Degtyarev system, it uses two flaps in the bolt to lock into matching recessed milled into the receiver walls.
The UK would return to the bullpup style of rifle a couple decades later with the L85 – which (contrary to popular assumption) bears no mechanical or developmental similarity to the EM-2 beyond the bullpup layout. The L85 is in basic terms a bullpup AR-18 – a short-stroke piston and a multi-lug AR-type rotating bolt. For more details on the EM-2 internals, you can take a look at this video I made when I had the opportunity to shoot and disassemble one: