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Ok guys, thanks for the info, I'll stand corrected now. I think the last M4 I had come across my bench was back on the fall, and prior to that were M4s, the 733 (with full cylinder, 100% of that because out of curiousity I tried it in my MP5, found my fps went down by 30fps, switched back), SR-16s, etc. So recently just did some more work on the 733 (changed new internals over to the reinforced mechbox), full cylinder still there, and a G&P SPR last week. Guess I assumed the TM 733 had a stock cylinder in it, is the shortest of all the Armalite inner barrels, so anything over that length had full cylinders, and anything under that length had ported. Just begs the question: If the stock 733 had never been opened before me, how did it get a full cylinder? Might explain the wildly fluctuating fps readings (360-390fps) we got last spring with it.
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