Free Float Rail and scope for Sig Sauer M400 Enhanced.

[MonkeyMadness]

Hey Guys,

I am a somewhat new AR-15 owner. Bought my Sig Sauer M400 Enhanced last year, and have taken it to the range a few times with friends. Love it so far.

Link to the gun:

http://www.sigsauer.com/CatalogProductDetails/sigm400-enhanced-fde.aspx

I have put a Bushnell TRS-25 3 MOA red dot, and have it zeroed for 100 yards:

http://www.amazon.com/Bushnell-Trophy-TRS-25-Riflescope-tilted/dp/B00CIY7JAU

However, at 100 yards, I feel like it's mostly the gun doing the work, and it's accuracy is very well maintained. I want to start doing 400-500 yards and want to learn how to shoot accurately at that distance.

I hear that a free-float rail system is more accurate, and cheaper than dirt has quite a few. I'd like to put a fore-grip on there as well. I don't know which length is proper, but this 7" looks nice:

http://www.cheaperthandirt.com/product/2-MWMI-T7G2-FDE?td_source=search

Also, thinking of a nice scope. The Nikon P-223 3-9x40 Mate BDC 600 looks very nice for $200:

http://www.amazon.com/Nikon-P-223-3-9x40-Mate-BDC/dp/B006YVT0R8/ref=lp_3226124011_1_10?s=hunting-fishing&ie=UTF8&qid=1442075616&sr=1-10

I learn new things everyday and when it comes to the AR-15, I am very much an amateur. Please let me know if the rail and scope I mentioned above are a good fit. Also, let me know if you have any suggestions. Lastly, let me know if I am approaching this in the wrong way. Just trying to improve as a marksman or just trying to become one.

[Click Boom]

You need a drop in 2pc rail (because of the fsp), or cut your fsp down and get whatever length 1pc FF that you want and add rail mounted front sight

[nate76239]

The Midwest rail will fit your rifle 7 inches is the proper length if you are keeping the existing carbine gas block , it should look like the one pictured on this page other than the different gas block

https://www.midwestindustriesinc.com/index.cfm?fuseaction=category.display&category_ID=1109

[MonkeyMadness]

Awesome, thanks guys.

[GoatLocker]

Replacing the stock hand guard with a free float rail will require that you remove the flash-hider, gas block, delta ring and possibly barrel nut (and obviously some tools). At that point, you can install a low profile gas block and go with any rail length you want.

For a little more money (and a lot less work) you could buy/build an upper more suitable for long range work and effectively have two rifles.

That said, if you are shooting well at 100 yards, why bother changing the configuration (other than using a magnified optic)? In other words, if it's not changing the POI from shot to shot at 100 yards, it won't be worse at 300. A hand guard doesn't care how far you are shooting. It's the other variables like wind, ammo, trigger, barrel, shooter, etc that will limit you. Not that a FF rail can't tighten your groups a little at 100/300/600 yards, but there are other more important variables.

[MonkeyMadness]

Good point goatlocker. I think I'll try that Nikon scope at 400-500 yards first and then see if I need to upgrade my hardware.


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