AndyC, thanks for covering Mike's questions for me.
However, this:
Mosin Guy said:
By having the nose on the front of the para top cover it allows you to completely assemble your para bolt carrier, bolt and para springs into your para top cover before ever putting them into your receiver, as opposed to trying to put them together piece by piece without the nose on the top cover - it just makes things so much easier with the nose on the top cover
Is not telling the complete story with regards to the aftermarket.
The reason I chose that particular top cover is because it has a removable guide rod (it's captured in a slot). You can push the guide rod forward, pull it down out of the slot, remove guide rod, spring, bolt carrier, bolt, etc. The top cover is semi-permanently mounted to the upper receiver and is never removed for routine maintenance. I say that's a good thing, since your optics are mounted to it. Reassembly is simple. No harder than reinserting an AK bolt carrier/recoil assembly.
3. Am I correct in saying that IF you use a Para topcover, you do NOT need to machine the upper receiver?
Yes. During the AWB, I built my rifle on a Dan Coonan receiver, full, fixed stock. Last year, I added a
DSA folder kit, with the optional
Alloy 'Hampton' Para lower (the one with the M16A2 type sight), the above top cover (another option) and swapped all the parts over. No modifications were required to any parts at all. It was truly a simple, "bolt on" conversion.
(I actually ordered that kit, then emailed them later asking them to add the upgrades. They were very accommodating)
BTW: Aside from the lightweight materials, and custom rear sight, there is nothing special about that lower or folding stock. A standard surplus Para lower could be substituted. I believe the carrier is standard Para spec as well (except that DSA's is a US made part). I can't see any differences between it and pics of surplus Para carriers (I actually used to have one, but sold it before comparing them side by side). I also see nothing in the text indicating that the top cover requires a DSA carrier. However, you might want to ask DSA or Grayrider to be sure.