The Mad Bull One Piece M4 Length Outer Barrel is constructed from light weight aluminum and fits most of the M4/M16 AEG on the market. This barrel is a great choice if you plan to convert your M16 into an M4 or if you plan to replace an old multi-piece outer barrel. One piece outer barrels are less susceptible to "barrel wobble" and their overall construction is stronger.
Fits Most M4/M16 AEG On The Market
Light Aluminum Construction
One Piece Reinforce Barrel
Used this to turn CA M15A4 CQB into an M4SOPMOD. SOLID fit. just beware of old type CA uppers it took my gunsmiths hammer and a nylon head to get it into place. No wiggles wobbles or anything to report. I have fit a Madbull Black python TB inner as well as a JBU 6.03 with no sanding or mods required. Price is great. Once again another awesome product from madbull that doesn't cost an arm and a leg. Just make sure you tread lock the lock screws up by the delta ring.
Seems to accept different inners without modification
Screws could be a liability if ignored
tight fit in upper. ( could be a good thing if you don't plan on removing it
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