Quoted: Stay away from the drop in kits -- if you want a piston go Hk or LWRCI
The others don't address carrier tilt, or pin in the gas block.
Show me a Piston Drop in that can fire 10k of rounds in a week and I will revise my feelings.... |
OK, I'll take the bait...
Ares Defense did address carrier tilt and when the USPTO publishes our patent application for the Black Lightning drop-in piston kit, then you can see exactly how it was addressed. We did not approach carrier tilt by using the "dog-knot" (circumferential ring of larger diameter on the back of the carrier, some companies using "ski's" and similar methods for limiting carrier tilt) approach on the rear of the carrier for a very good reason, and here it is:
There are literally millions of AR15/M16's in the global marketplace. They have been produced by many different companies under many different manufacturing/QA guidelines. If a company's approach to fixturing the lower receiver forging for machining is substandard (and many are), then the receiver extension tube thread in the lower receiver may not be concentric the the bore axis, and accordingly, nor will the carrier be concentric to the receiver extension tube. So, if a receiver extension tube's concentricity to the bore-axis is out only a small amount, or if there is any angularity (even a very small amount), then the "dog-knot" approach to carrier tilt will cause the carrier to bind in the receiver extension tube somewhere in it's 3-3/4" stroke length. Did you ever wonder why a carrier's diameter is reduced from a nominal .995 to .930 along the portion that travels in the receiver extension tube? If you have, then now you know why.
Having said that, remember that our kit (now being produced by Bushmaster under exclusive license) retrofits to most OEM carbines. However, some manufacturer's have oversized passage in the upper receiver and tilt may show more. The fix to this is to use a quality manufacturer/supplier for your upper receiver; i.e.: a company that exercises quality control and establishes/enforces reasonable tolerances in the components they produce.
Finally, you want to know which "drop-in" piston kit will go 10,000 rounds in one week and so I'll tell you that too. We fired our patent-pending Black Lightning kit (the first true "drop-in" kit) at Bushmaster's facility and exceeded 10,000 rounds in one day, with no malfunctions! If you have your doubts, view the inside front cover of Bushmaster's 2008 catalog where they reiterate the point. Also, some operators in Afghanistan have been employing Black Lightning kits in their M4's for over 2-1/2 years! Do you really think they would be betting their lives on our Black Lightning "drop-in" piston kits on a daily basis if they were experiencing any problems with it? I don't, and I don't believe that most reasonable people would think so either.