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Posted: 11/29/2006 9:27:42 PM EDT
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I have a Bushmaster M4 that I would like to be able to mount a quick detach scope mount too. I don't have a measuring tape on hand and thought that maybe with some pictures you all might be able to point me in the right direction for one of the SPR style mounts. I have rear flip up Wilson sight on the gun that sits approximately 1/2 to 3/4" of an inch above the rail http://wilsoncombat.com/r_flipup_rear_sight.asp . I need to be able to keep the iron sights on. The scope I'm using is a tru-glow 3-9X44mm with a 1" inch tube http://truglo.com/content/prod_scopes_reddots/reticle_scopes.asp . When shooting prone I am pretty close to nose to charging handle and when off hand I'm just slightly further back then that. I also prefer to have the scope mounted as low as possible that my current setup will allow. Hope someone can recommend what I should get, sorry for not providing better spec's. I've included a picture of the scope and rifle in the position I would like to be able to mount it. I'm open to other manufactures as well especially if I can't get the Larue in a timely manner or if there is something better. http://i39.photobucket.com/albums/e159/sigsauerp229/2006_1121request0002.jpg |
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The LaRue mount is definitely the best choice, however there are two available heights. The LT104 works for 95% of the applications similar to yours. However that Wilson rear BUIS looks a bit tall. It may be close, and I'd recommend you take some more precise measurements of both the BUIS height and the scope's ocular bell diameter. With this information, post an update here or call LaRue directly and ask them. The other option is to go with the LT135 which is guaranteed to fit as it is taller. Here is my setup with the LT104. The BUIS sits 0.46" about the rail and the scope's ocular bell diameter is 1.7"  |
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The SPR from Larue should cantilever far enough but I'm not sure about the height. THey do make the 1.93 version which sits a little higher. I would suggest getting your exact measurements and give Larue a call...they have always been quite helpful when I have called them. They should be able to tell you if your set up will work. |
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Hopefully someone will chime in if my logic is incorrect: Could you not measure the diameter of the widest part of the ocular lens (looks like it’s widest around the power ring), divide that in ½ and add the height of the BUIS at its tallest point? If this is < 1.5” (+/- a margin of error) you will be good with the LT104 if not get the LT135. Yes, the Larue is the |
That looks like solid math to me. Give it a try. EDIT: Nope, I spoke too soon. I'm under the impression that the 1.5" measurement on the LaRue mount references the bottom height of the scope's body tube from the rail, not the ocular endbell. Try this instead; Starting with 1/2 the ocular bell diameter, subtract 1/2 the scope tube diameter (0.5" in this case as it's a 1" scope tube). The difference would be how far below the bottom of the scope tube the ocular bell hangs. Now subtract this value from 1.5". If that number is larger than the height of your BUIS, then the LT104 will work. EDIT2: Damn! Now I'm under the impression the 1.5" measurement on the LaRue mount references the centerline of the scope, not the bottom of scope's body tube. If this is true, SNIPERm88's original math will work just fine! Sorry! |
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Half of a 1-3/4" ocular bell is 7/8" or 0.875". Using the math we established earlier, if your rear BUIS sits 5/8" (0.625") or lower you will be fine with the LT104. Otherwise get the LT135. Or better yet, get the LT104 and buy a new rear BUIS like the low sitting Troy Battlesight. I'd hate to see you stuck with the taller LaRue mount just to accomodate that beefy BUIS. You said yourself that you'd like to keep your scope as low as possible. And I have one other thought for you. You said your budget scope will be replaced eventually with a better one. When that happens, you will find that 30mm is the new "standard" in tactical scope tubes. I'd recommend you consider buying the LT104 in 30mm and using LaRue 30mm ring inserts (LT136) with your current 1" scope. Yes, you can buy the LT104 with 1" rings and later buy the 30mm rings, but buying the 30mm rings later is close to $100, and these inserts will only cost you $60. Just something to consider before you drop your hard earned cash . . . |
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Ok I measured the sight. It measures 3/4" from the top of the rail and 7/8" for a total thickness. I emailed Larue about a week before posting this and then again when I posted this. Are they normally hard to get ahold of through email? Do you loose a good cheek weld when using the taller mount. Would I be better off in replacing my rear sight with a Troy? http://i39.photobucket.com/albums/e159/sigsauerp229/2006_1206armeasurments0004.jpg http://i39.photobucket.com/albums/e159/sigsauerp229/2006_1206armeasurments0002.jpg |
Just call me tomorrow. 512-248-1585. E-mails are getting a little ahead of me. A lot can be handled in one phone call....e-mails start ricocheting back and forth and holy cow... Mark LaRue |
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