Need input on

[18Ddave]

I am looking to purchase some conversion bolts and barrels for force on force marking rounds i.e. Simunitions, UTM, etc. I do not want to purchase the 9mm Simunition items. They suck. The magazines break and wear n tear too easy. You also cannot use the uppers with the rail systems for lights and other M4 gizmos. Lastly, they are not very accurate. My questions are; does anybody have any experiences working with the newer 556 Simuntion rounds (w/ conversion bolt) or the Ultimate Training Munition, Man Marker Rounds (w/ conversion bolt)? What do you think? What are the pros and cons for the system you have used? I like the fact that you can use regular mags and the complete weapon system without f-in with the sights or rail system. I want to make sure my guys get the most realistic and durable items. Any input is appreciated.
Thanx
dave