Modern Sporter - Build Discussions

[J.L.C.]

So it shouldn't stick out at all?

[TopShelf97]

Anyone know if a 12.25” Daniel Defense RIS II handguard would fit on the upper receiver? Even if it does fit, would it look weird on a rifle length 18.6 inch barrel? Has anyone used a RIS II on their reciever yet?

[takeyerswing]

Anyone know if a 12.25” Daniel Defense RIS II handguard would fit on the upper receiver? Even if it does fit, would it look weird on a rifle length 18.6 inch barrel? Has anyone used a RIS II on their reciever yet?

You will have to modify the mounting bracket to fit the upper receiver. Yes, it will look slightly off with the gas block/tube exposed.

[odsixer]

So it shouldn't stick out at all?

I had to file mine down also, scavenged it from an M&P, as long as it clears the bcg serrations when not being pressed you're fine.

[hannibal.black98]

Some tips and tricks I found on my F/A Sporter build:

1) Standard Geissele handguard modification as discussed previously (I utilized a fibreglass grinding wheel and a dremel, cut like butter). CAREFUL.
2) F/A Installation I had to go through 2 forward assist assemblies (Mil-spec) to find one that fit, no idea why.
3) Strike Industries enhanced dust cover is only one that worked on my Upper that wouldn't have needed cutting of standard dust cover rod (Shortening)
4) Required a shorter bolt to install my Ergo grip. Bolt that came with it was too long and bottomed out.
5) TNA Reaction Rod used for majority of build. Lifesaver
6) Buy good quality roll pin punches and use lots of grease/oil

Nice looking guns!!! (and grass too LOL!!!)

[Uisge]

No, if it sticks out, and can touch the bolt under recoil it will jam the FA into the pin and lock up the rifle. Trust me, happened my first trip out with my sporter. I used my stag as a guide as to where it should be, then I went a bit more, and I lengthened the slot for the pin too. Still works great. It doesn’t need to be even close to the BCG, once the pin disengages the cam it drops right in there.

[TopShelf97]

You will have to modify the mounting bracket to fit the upper receiver. Yes, it will look slightly off with the gas block/tube exposed.

Thank you.

[J.L.C.]

I've now tried the SI FA, and they Colt FA in their stock configurations and modified by swapping prawls and springs. The carrier binds in every configuration.

Would that suggest the upper is out of spec?

[jonny427]

You also will have to modify the fasteners. The upper 2 cap screws need to have the heads ground down in order to reduce the radius enough to clear the upper and washers will need to be used. Side locking screws will not fit so you have to just go with 4 instead of the 6.

[davide montini]

Anyone here build a 6.8spc .....been thinking about building one ..... what twist rate barrel ...what make ....bolt....
Anyone have any suggestions....I’d like to here them ....trigger gesissle ......hmmm Gen 3 magpul adjustable rear stock......front stock ...black label ....
But ...bcg???jp???......barrel ....muzzle break...
Any suggestions people .....and thanks for your opinion