Your missing White Oak's SPR upper which is better than the BCM and Aero options IMO. If i was buying a complete upper for an SPR this would be it
https://www.whiteoakarmament.com/sho...dm-uppers.html
They have options for different twist and gas lengths. If you choose a regular upper with no fluting they are $675 and include BCG. Come with ALG v3 handguards which are solid
If you didnt already have a complete lower teh Larue Ultimate Upper kits are a great value at under $800 for everything but the lower receiver
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