Ar15 bolt release problem

[xbuilder9mm]

This my first ar 15 assembly. Other than this problem, everything else works great. It is an Anderson 223.rifle. After loading a new magazine it takes an extraordinary amount of force to press the button to release the bolt and load the first round.
Any suggestions are greatly appreciated, thanks,.

[SkyHawk]

Does it do this with no mag inserted?

are you inserting a loaded mag or empty mag? If it is a loaded mag, take off the upper and be sure the bolt catch tine is not hanging up on the live rounds.

If not, maybe put a very small touch of grease on the back of the bolt catch where it catches the bolt.

[ar15barrels]

Reduce the number of rounds loaded in the mag by 1 and see if it gets better.

[xbuilder9mm]

I took it to the range and other than that everything works great, I will try the small touch of grease.