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Posted: 2/23/2007 9:12:11 AM EDT
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A registered M16 is basically a ar15 type receiver with an autosear hole and a M16 LPK. A RDIAS doesn't require a hole? How does it stay in place while in the receiver and not move about? Does a RDIA need a M16 LPK or will it work with an AR15 LPK? What about a RLL? Do they need an M16 LPK? What happens if you remove the link with the M16 LPK in place, a felony? |
An RLL will work with an AR15 FCG. However, in that config it will only Safe-Auto, no semi. There are select fire kits out there from Scott Bell. I have one in my lower with the RLL and works like a charm (safe-semi-auto). The FCG is a heavily modified M16 FCG and does not fire full auto without the RLL. Leaving the FCG in without the RLL is a grey area. On one hand the BATFE frowns on use of M16 FCG in AR15 lowers, however, the FCG is so heavily modified that it no longer is an M16 FCG. On the other hand, the BATFE has a letter to COLT circulating stating that if the M16 parts don't cause the firearm to fire F/A then there is no problem. Here is the letter :   HTH |
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IMO, for best operation and ease of use (timing), it is best if the DIAS is captive on the takedown lug of the upper. If it is grossly flopping about in the lower, there may be issues with fore and aft movement causing timing variations. Remember, it is the bolt carrier that trips the DIAS, and if the DIAS is fixed on the upper, then the timing will be consistent. Many DIAS bodies are drilled/tapped for a set screw to do just this. Others (mine is one) are simply a nice friction fit. Still others were machined a bit loose in the first place, so that they can be shimmed fore/aft relative to the takedown lug and thus alter timing. Variations in takedown lug dimensions can cause issues, too. I don't recommend dicking with a DIAS body unless you are an expert and have machining experience. I have been very lucky and have had 100% plug and play operation between a half-dozen uppers. YMMV. |
Here is some infro from Quarterbore that will clear things up a bit: Quarterbore He also has a very good write-up about RLL's, etc... |
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