BM59E Build

[JTN412]

I recently purchased a BM59E kit from Sarco. I sent the bolt, barrel and receiver away to seat the bolt, mount the barrel and headspace. I just finished assembling the rifle. I have two questions. One: My oprod and bolt run very smooth when not mounted in the stock. When I fully assemble the rifle it takes some effort to move rearward but seems to slam shut just fine. If I gently run the action I have to tap the bolt closed with my hand. I greased up the bolt lugs and channels and it doesn't seem to be obviously rubbing on something. Do I just need to break this rifle in? Secondly, I can't seem to figure out what this part is. Its a small rectangular piece that is maybe some kind of tool for the M1 sights? I took a picture of it next to the hand guard pin for reference. Anyway here are some pics of it next to my BM59 ITAL. Any help is greatly appreciated.

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