AR Sponsor
Posted: 11/29/2007 3:32:05 PM EDT
Out of all my ARs I just noticed this difference. Why is there a difference in how its designed. It is the only one I have that is different. Look where you can see the safety inside the lower, the walls of the lower are different on the right one than all of my others.
|
|
at first i was thinking "low shelf/high shelf" but from the pic, i think they are both low shelf, someone else might be able to help more... |
|
If you are askingwhat I think you are asking, you've just discovered the difference between high and low shelf lowers. I think high shelf lowers can tighten the fit between an upper and a lower, but it prevents the use of a registered drop in auto sear. Low shelf lowers allow the addition of a RDIAS. If you have no interest in getting a RDAIS, I dont think the difference will really matter to you at all. If you think you might get a RDIAS one day, look fior low shelf lowers. Anyone else know other differences? Im curious too. |
| I'm with ALPHAGHOST on this one. I have a preban Oly lower that looks just like the one on the right also. My new Noveske stripped lower also looks like the one on the right. It is a low shelf lower just like my Colts green labels and Bushmasters lowers. It will take the RDIAS even though it doesn't look like it, it is alittle tight though. I really don't think the extra aluminum in that area has anything to do with High/Low shelf, all depends on what the manufacture of lower is. Some look like that and some do not, depends on the maker. |
|
ALPHAGHOST, I think your first impression was right. The one on the left looks high shelf to me. Note how the shelf is even with the top of the safety body. The one on the right is unmistakeably low shelf; the presence of the Accuwedge proves it. Like LMT vs. Bushmaster: high shelf vs. low. [Edited for style] |
|
Is that one lower from a different manufacturer than your others? That area over the safety is where the auto sear is housed in an M16. Manufacturers of semi-auto rifles have to make that area different from the full-auto version, so that an auto-sear won't fit, but there are no standard drawings, so each manufacturer does the modification in a different way. |
)
|
Disagree. The entire area is machined, so I don't believe any significant time is saved by machining that area narrow versus wide. My assumption has always been that the area is machined narrower to prevent the installation of an M16 auto sear, which would otherwise be possible with very minimal modification to the lower. |
AR Sponsor