BudsGunShop.com - Is model 8541 in the Ruger MPR series

No, this is not an MPR rifle. The MPR series comes with an upgraded stock (magpul MOE SL on the 18" and B5 Systems on the 16") this one is a basic milspec stock, the MPR Also features the Elite 452 series 2 stage trigger trigger, and a muzzle brake this one has a basic single stage milspec trigger and an A2 flash hider. Pistol grip is upgraded on the MPR as well.
I own an MPR and the trigger upgrade alone is worth it in my opinion

This gun is no longer in production so If it has the features you want then get it and it does not matter if it was a MPR or not Firearm Specifications
Manufacturer: Ruger
Model: AR-556
Caliber: 5.56mm NATO
Barrel Length: 16.10"
Twist Rate: 1:8"
Overall Length: 32.25" - 35.5"
Receiver Material: 7075-T6 Aluminum
Receiver Finish: Barrett Brown Cerakote
Weight: 6.7 lbs
Magazine Capacity: 30 Rounds
Handguard: 11" Free-Float Handguard with M-LOK Attachment Slots
Weight: 6.7 lbs.

Edward, does not look to be Sir according to Ruger's website : https://ruger.com/products/ar556MPR/models.html