Lots of stuff - please scroll all the way down. No Trades. All parts came off of my personal Colt AR-15 Government Carbine - listed in separate post - to make room for my new Mark12 SPR. Item 1 - Knight's Armaments M4 Carbine RAS - Free Floating Barrel P/N 20208 gently used but as you can see is in like new condition with no nicks, dings, or gouges and threads and mounting hardware are in excellent condition - mounts rock-solid to upper with no twisting or movement. $250 delivered to US only. Item 2 - GG&G BUIS A2 Rear - excellent condition - $85 delivered to US only. Item 3 - GG&G Flip Up Front Sight for Dovetail Gas Blocks - excellent condition - $85 delivered to US only. Item 4 - Yankee Hill Machine Single Rail Gas Block for .625" barrel - perfect condition - $50 delivered to US only. Item 5 - Model 1 Sales AR15 Flat Top Upper Receiver stripped - excellent condition - worked flawlessly on my rifle - in spite of some folks negative opinions about Model 1 Sales parts, this upper proved to be excellent. $65 delivered to US only. No Trades - PayPal firstname.lastname@example.org - please email any questions or confirm item availability prior to sending funds. Items listed on other sites. Thank you for looking.