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.

Information

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[browningautorifle]

Nice looking rifles, I think it may just need a break in. Take it through about 500 rds and see if it's still tight.

[HOOKED ON HISTORY]

Nice rifle. Backdrop nice as well!
FastOnRaceDay.

[JTN412]

Thanks. I figured it would look cool next to the 1929 Model A. Still haven't gotten out to shoot but hoping to sometime next week.

[browningautorifle]

Still haven't gotten out to shoot but hoping to sometime next week.

We'll be watching, let us know?

[JTN412]

I will. It has been tough lately to get to the range with work but I'm itching to get out there

[daengmei]

I can't seem to figure out what this part is.

https://www.standardpartsllc.com/pro...&idcategory=26

Part of the select fire for semi/full auto.