RPD 100 round belt and Ohio 31 round limit.
Can someone direct me to the form needed to make a semi RPD a NFA item as to allow the full use of the 100 round belts

thanks

If you are planning on making it a short-barreled rifle, you need to fill out ATF Form 1, send them a check, and wait many months.

can I make it a destructive device to negate the 30 round limit?

How do you plan on making it a destructive device?

I honestly don't know if you can have something "declared" an NFA item without actually turning it into an NFA item.

by putting the loaded 100 round belt in it makes it a machine gun/ destructive device per ohio law.  

I want to make it a NFA item by using the 100 round belts
I do not want to alter the firearm in any other way

You have to file the paperwork (and get approved, get the stamp) before you "make" the NFA item....like a SBR.  So yes, your weapon can be declared NFA, and not yet be of a configuration that is NFA regulated.  Having a tax stamp only says you have a weapon that can be configured in such a way that it meets the requirements of being an NFA weapon.  

For instance, you can get an SBS tax stamp, and have an 18" barrel on that shotgun.  You cannot put the SBS barrel on it before you have the stamp, so therefore, the shotgun MUST be declared NFA BEFORE it is configured as such, unless it is sold in that configuration, necessitating the NFA paperwork be done before transfer.

Understand all that.  No 100 round dumps till I get the stamp

What form am I to fill out and send in to the ATF that will allow the use of 100 round belts in and negate the 30 round limit in ohio?

I understand the Law.  I just want to know what form I have to fill out , pay $200 , and wait a year to get back.

Answered in my first post: ATF Form 1

Form 1 thank you
You mentioned making a SBR which threw me off as I do not wish to make a SBR and never mentioned it in orig post

So what do I do?  Form 1 asking to make a SBR, get approval ,get stamp but don't SBR the rifle but since its a NFA item that will negate the ohio 30 round limit ?

I hate writing the ATF.

I'd be careful with that. According to ATF, it is not an SBR when it has a 16" or longer barrel on it. You may need to cut the barrel to 15.99" in order to make it legal.

Question 4b  what type of firearm?

The term “firearm” means: (1) a shotgun having a barrel or barrels of less than 18 inches in length; (2) a weapon made from a shotgun if such weapon as modified has an overall length of less than 26 inches or a barrel or barrels of less than 18 inches in length; (3) a rifle having a barrel or barrels of less than 16 inches in length; (4) a weapon made from a rifle if such weapon as modified has an overall length of less than 26 inches or a barrel or barrels of less than 16 inches in length; (5) any other weapon, as defined in 18 U.S.C. 5845(e); (6) a machinegun; (7) a muffler or a silencer for any firearm whether or not such firearm is included within this definition; and (8) a destructive device.

1 no
2 no
3 no
4 no
5 ?  have to read 18 U.S.C. 5845(e)  
6 no
7 ?  permanently attach a suppressor ?
8?  what's a destructive device ?  might I have a destructive device due to the large belt capacity?   Though I believe Ohio law states that anything over 31 rounds is a machine gun not a destructive device.

Looks like I am probably screwed on this deal

Edit/update
5-7-8 no
so I have to break up a few belts

That's ultimately what I was trying to get at, I don't know what the ATF would think if you Form 1'd your gun but never turned it into an NFA item.  I mentioned SBRing it because that's about the only thing you can do that would make it an actual NFA item.