No, for NM shooting the weapon has to be in the original military specification or appear to be in the original configuration. For an AR, I know you can put a FF tube under the regular round M16 style handguards, you can use a cut rifled stainless barrel, and you can use a two stage trigger that is designated "NM". You can also put varying amounts lead weights around the handguard and in the standard A1 or A2 buttstock (I think you can use an A1 buttstock). Add a shooting jacket, shooting glove, and a real fine leather sling that connects to the FF tube and buttstock and you are in business! You'll need the roll cart or folding seat to haul the various other stuff to easily and comfortably compete, but that is about it. Highly restricted like in NASCAR, I like it because it weeds out the gear advantage for the most part and makes for a competition based on the skill of the shooter. I believe the 20" HBAR (or perhaps a more conservative profile) cut rifled barrel in 1/7, firing 75-77gr. match, with a tunned RRA NM two stage trigger (it is quite nice once it has been tuned) built on a matched and otherwise mil spec chassis with A2 upper and JP Ent. small parts, and with the allowable FF tube and weights (if needed) would make a rifle most definitely suited to serious competition in this sport. This will be my build by the way when it ramps back up this Spring. I already have a lot of the parts, just got to get new ones for another rifle... Yeah, I'm a cannibal. But I've also shot this match before and built rifles for that and other purposes.
For the sights you seek, go search on Rainier Arms first. They are an AR superstore and do great work. If no luck, try Midway. Look under "gunsmith parts" or "AR parts" or whatever it is and find "NM sights" or something similar in that long list. There are also lesser known sight makers that make great NM sights too, so don't overlook those. JP Ent. is definitely worth looking at, but they tend to cater to 3gun mostly. However, I build my own AR's, and can say that from my experience, they make the best parts, especially the bolt carrier, LPK minus trigger, and the other small parts needed to complete an AR build. Phenomenal quality.
At any rate, you WANT the NM components. You don't NEED them, you can certainly shoot with standard AR irons, but the NM sights are worth it in my opinion for this kind of shooting as stock standard AR sights are quite loose. There isn't much you can do to these rifles to begin with, kind of like NACAR for rifle shooters. So for sights, that means the full rear sight, the drum, the leaves, aperature, all of it. If you don't know how, learn how by youtube, online, or in a book (I use all three when I do stuff I'm not familiar with) to properly change the parts out and how to put them back in to work best for what you are doing.
You can change these out on an A2 OR flat top with carry handle, but since movement is possible even when carefully loctiting the mil spec carry handle down, it is advisable, and a lot of shooters do this, to use the A2 upper instead for this kind of match shooting. But don't despair if you have a removable carry handle, just loctite it good.
I also use a narrower front sight post --Midway sold it to me. I get much clearer, crisper, and less obstructed sight pictures. I'd say if I could only have ONE part to add to standard iron sights, that narrow square front post would be it. Getting a can of "Sight Black" is real nice too, I use before every shoot. Basically lampblack that sprays on like paint but just wipes off when cleaning. Nice flat black sights, front and rear.
I'll also add this for others: if you change the barrel or front sight assembly (including the "gas block") with another, you'll need to be sure to get proper one. Some sloppy barrel makers will just use any assy. on any rifle, but there are special ones for flat tops and different ones for A2 uppers. They are not the same and the sights will not line up if you use the wrong front sight assy.! There is a fix, but it doesn't look ideal for match shooting. Usually flat top front sight assy.'s will have "F" marked on them.
Also, when getting your NM sight assy. for the rear, keep in mind there are two different types. One is for the M4 and it has graduations and stops for a 600m range max. The regular NM sights for standard length 20" AR's have drums with graduations and stops for an 800m range max. Now for this kind of shooting, you'll be collecing data at all the firing lines so the numbers on the drum don't have much meaning. Why do you need NM drums with useless markings then? Because they have less play and much more precise adjustments that apply directly to your data. You'll be more concerned about how many clicks from bottom or last zero --but I already wrote a bunch about that on here recently about laminating your data to your stock behind the charging handle, you could dig through my posts for that if interested. Some laminate the data to the drum, but there can be problems with that too. I prefer a dope book and laminated data on the buttstock behind the charging handle.
Good luck! Sorry if I went too in detail for you, but sometimes this helps other.
