This is a great way to get some trigger time on your AR while spending pennies on ammunition! Getting married in a month and I'm finding out what an expensive endeavor it is! So, time to let this baby go to a new home. I've had really good luck with CCI copper plated 40gr. bullets. It doesn't seem to like the Remington as much and I've had a few FTFs with this ammo. I've put about 300 rounds through it total and it's been cleaned every time after use. I always make sure to run a few rounds of 5.56 through the AR after shooting .22lr to blow out the extra crud built up from the dirtier ammo and this has worked perfectly. This is the Stainless Steel model (which makes cleaning a breeze when compared to the parkerized model). It is also the top end kit that comes with the drop-in forward assist and the bolt-hold-open adapter along with the Anti-jam charging handle. It will come with one extra Black Dog 26rd. magazine. Paid $230. I'll let it go for $180. Price is firm. Sorry, no trades (as much as I'd like to). Please PM responses. FTF in Portland (NE or downtown). Thanks for looking. Manufacturer's description: "Everything you need to convert your 5.56x45mm AR-15 to .22LR!! Right handed .22 Evolution conversion kit for AR-15 rifles with forward assist adapter. Stainless steel, piston compatible, steel extractor pin, stainless steel firing pin captured spring, cotter pin in bolt retains firing pin, Drop-in forward assist adapter, buffer retaining relief cut, chamber adapter with improved live round extraction. Includes: Right Handed, Stainless Steel FA Equipped .22LR Action BHOA Actuator 25 Round BHOA Magazine Anti-Jam Charging Handle Patent Pending Note: Compatible with any 5.56 NATO chambered AR-15, including Gas Piston Systems where the piston enters the receiver no more than 1 - 7/8 inch. Only for use in 5.56 NATO chambered AR-15 rifles. Setup is less than 30 seconds. Ammo is 1/10 of the price of 5.56 ammo, so that means a significant savings to you. "