I just started using the KWA PTP pistols for beginners handgun safety course instruction and demonstrations, and to run through competition course of fires. Seems to be working well and my Soldiers like using them. The KWA PTP is very realistic with the same size, functioning, weight, trigger pull and recoil of an M9. I buy them used for around $100 on ebay.
http://kwausa.com/products/ptp/. I also attached a cheap laser sight to use for instruction:
http://www.midwayusa.com/product/342...le-mount-black
It's great when giving a course when firearm ranges aren't available, like at night.