guess

I got this yesterday from the antique center at EX RAF Hemswell, has anyone got any idea what is is? You can see a red detonator through the hole in the end. The only markings are the stencils you can see (36\SM MK1 MOD3) no stamps that I can find. Could it be an inert practice round, USAF...

The first thing I have finished in probably a year and the first thing I have touched since April when I was laid up for a month.I took about 20hrs I guess over two weeks it was fun and the Camo is totally fabricated from my mind "it's my model !" :)

I guess better than a scrapyard. Taken in San Francisco.