I got my help from this thread, and thank you again to ORD. aaargh.. that's the setup I hate to see. Moreover, telling someone that an extension can be modified, while not a lie, is nothing more than mental masturbation when your post contains a caveat for having the knowledge and proper tools. Is it worth the extra 50 bucks?" I use it for hunting dogs only. Went back to the sellers website and found I was not the only one with problems. I wont buy a barrel that isnt a wylde 223 556 but Im only now noticing. I think your mistaking that with adding ramps to the receiver. The M4 ramps, if I am not mistaken, were originally made to help reduce malfunctions on the M4 carbine. Shopping with us is absolutely safe - you never have to worry about credit card safety when shopping here Share your latest AR build or photos from the range with #RangeDayFriday for a chance to win a new firearm! Polishing the edges of the chamber mouth to remove the edges of that chamfer will. You can always buy a non-m4 extension and have the new barrel retimed and headspaced, but it will probably cost more than a new upper receiver. Konza Defender M-LOK 5.56 16" Rifle 1x7 FEATURES: 16" 4150 Nitride 1x7 5.56 Barrel T-Marked Upper with M4 Feed Ramps Steel Micro Gas Block, and Carbine Length Gas Tube 15" 7075 T6 Aluminum Free Float M-LOK Hand Guard A2 Muzzle Break BCG is an M16 Style Nitride QPQ Finish Charging Handle Mil-Spec 6 Position Mil-Spec Diameter Stock As a result, the factory machined M4 feed ramps on the receiver are hard coat anodized which adds significant strength to the aluminum. We reserve the right to edit as appropriate, delete profane, harassing, abusive and spam comments or posts, and block repeat offenders. This can lead to a rare but odd situation; barrel and receiver mismatch. Press J to jump to the feed. Thats receivers, bolts, and on down the list of the 100 or so parts that can make up an AR-15. Reddit and its partners use cookies and similar technologies to provide you with a better experience. There is a picture of the various options, hopefully another poster can link them. In case My barrel is rifle ramp it won't be so bad after all. You have a rifle barrel. Barrel Length: 16" Barrel Material: 4150V Chrome Moly Vanadium Steel Barrel Finish: Phosphate Barrel Profile: M4 Chamber: 5.56 NATO Twist Rate: 1 in 7" Extension: M4 Gas System: Carbine-Length Gas Block Type: Low Profile .750" Diameter Upper Receiver: Forged 7075 T6 Aluminum Receiver Style: M4 Flat top with feed ramps Receiver Finish: Hardcoat Anodized Edited April 27, 2014 by Mark Gale And that the M4s and M4A1s are issued M855 which has a slight difference in bullet shape vs. the older 55gr M193 BALL. Either way is good and both types work great with semi auto only guns. PRI MK 12 Mod H 16" 223/5.56 Upper w/ 1-7 twist Please allow 5~10 days for assembly and testing before ship date. My alternative plan is to do exactly as you describe. By my estimates, the tip of the bullet first hits the barrel extension about 1/3 of the way up the respective feed ramp on the barrel extension. FN AR15 barrels are hammer forged using the same proprietary high-grade Chrome Moly Vanadium steel used in FN's venerable machinegun barrels produced to handle the punishment of . Should M4 feed ramps come with the barrel or upper? : r/ar15 - reddit

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