I've got a foregrip that looks like the picture from JRS58, a front site tower (standard fixed sight). I also have the standard take off carbine-length handguards. Give me a PM if interested.
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Check out Damageusa.com, they have good deals that beat anything I have found at midway or brownells all military spec stuff.
I have everything to build a lower. PM what you need and I'll see if I have some discounted or spare parts.