The Heckler & Koch G11 is probably the most famous and recognized non-production rifle ever.
Even today, over 50 years since its development began, the G11 still looks like a firearm of the future.
The HK G11 used a 51 gr caseless 4.73×33 mm projectile
Technical Specifications (from 1989 H&K Brochure):
Length: 75cm (29.3in)
Weight (unloaded): 3.8kg (8.4lb)
Barrel Length: 54cm (21.3in)
Action: Gas-Operated, rotary breech
Feed: 45 or 50-round, single stack, box magazine
Cyclic Rate: sustained fire: ~460rpm / 3-round burst: ~2,000rpm
The G11 has an Integrated optical sight, which I think was developed by Hensoldt AG.
All pictures by Jeremy Tremp, used with permission. Please check his Instagram account out.
Fun Fact: The Heckler & Koch G11 is banned by name in Canada. (Source)
The firearm of the design commonly known as the Heckler and Koch (HK) Model G11 rifle, and any variant or modified version of it.