Well, i have been contemplating and now, after watching the guys shoot CMP today, i have decided i want to shoot that. I have no rifles that fit the criteria so i need to buy/build another. If i understand the rules correctly. I need a 20" basic A2 or A4 type rifle. A quad rail is acceptable and a trigger up to 4.5lbs is also ok. I want a 5.56 with 1/8 or 1/7 twist. Now, searching the web i realize not many complete 20s are available and uppers seem to be hard to find. Gunbroker has a few but they are 1/9 twist. What are some makes and models i can buy off the shelf? on the web they are out of stock or don't offer what i want. With a model, i can call a few local dealers and see if they can get it. Also, do any of you guys shoot CMP with the AR? Do you have any tips or tricks? Wanna kill these ads? We can help!