Really nice idea and best of luck to you.My suggestions are:M1 Carbine (the ww2 carbine that max brooks suggested may be good in a zombie apocalpse) http://zombie.wikia.com/wiki/M1_Carbine#M1A1_Carbine_.30_Cal.EF.BB.BF Ruger 10/22 as you suggest - a pretty ideal anti-zombie gun. Since it is using a .22LR round then some variants with effective suppressors would be greatSemi-auto only versions of military weapons - ok, not a big modelling request - but it would be nice if you found some AR-15, AK or SCAR type weapons that accepted standard magazines but were locked to semi-auto. Perhaps a rare spawn in residential buildings.SR-47 - An AR-15 type rifle, but designed to accept standard AK47/AKM 7.62x39mm. This was designed for special forces on long missions -so they didn't have to rely on a ressuply of NATO ammunition and could instead us captured ammunition. http://www.liveinternet.ru/tags/SR-47/ L1A1 SLR - British version of the FN Fal. Main modifications are that it is locked to only fire semi-auto and is coloured black. It also accepts the L2A1 "Suit" 4x magnification scope. http://world.guns.ru/assault/be/fn-fal-e.html (3rd image down)Smith and Wesson M&P15-22 - An AR-15 type semi-auto only weapon which fires .22LR. With the addition of some standard equipment like a small scope, supressor and flashlight it would make a great anti-zombie gun that an ordinary civilian could get their hands on legally. http://en.wikipedia.org/wiki/Smith_&_Wesson_M&P15-22 H&K G3/PSG1 - Widely used rifles firing the NATO 7.62x51mm round http://world.guns.ru/sniper/sniper-rifles/de/hk-psg-1-r.html TAR-21 Tavor - Israeli assault rifle http://world.guns.ru/assault/isr/tavor-tar-21-e.html AN 94 - Russian assault rifle that can fire a two shot burst with very little time between the two shots - maximising the chance of hitting the target. http://world.guns.ru/assault/rus/an-94-abakan-e.html Pump action shotgun with massive suppressorKRISS Super V - a Submachine gun that fired .45 acp but uses an innovative recoil system to greatly reduce barrel rise during full-auto/burst firing. http://world.guns.ru/smg/usa/kriss-super-v-e.html SKS - VERY popular russian designed semi-auto rifle that is known to be very reliable and due to its popularity in the USA - many add-ons are widely available for it. Since the standard magazine is just 10 rounds - but each shot is as powerful (and loud) as an AKM one, then I think it would make for a good low-tier military weapon.Best of luck with what ever new weapons you decide to work on