NEW SPR TROUBLE ON FIRST RANGE TRIP. UPDATE IN OP.

[Straight Shooter]

Ok Gents- need help & advice.
Had a 20" rifle built by a local 'smith back in March I think. Took it to range next day, slow fired 60 rounds to check function, hung up a couple times in chambering, but was ok otherwise. Rifle was put in safe until 4JAN21.
You can find all the details of the rifle in the Custom forum under the title After 5 Years...the Precious.
So, had first class Match Ammo, several different brands of mags, from 10,20 & 30 rounds..all mags have been vetted in two other rifles for years.
Here is what happened. Upon first loading the first mag...failure to chamber, bolt lacked about 1/2 inch or so closing. Hit forward assist, closed bolt...CLICK. Took out the round, small indent on primer. This happened 3 times in a row.
Took out the National Match bcg..cleaned it thoroughly, then rifle would fire. BCG felt very sluggish. Was a cold windy day, and at this point was lubed with Ballistol after cleaning the bcg.
Several more FTF & FTF after this with several known mags & Match ammo from IMI & Black Hills.
So, ruling out mags & ammo...Im think the bcg is the culprit, but dont know how or why. I cannot give out accuracy results yet, due to the windy conditions of the day and my frustration at the moment with the gun.
So- advice & opinion needed here ,and thanks very much in advance.

UPDATE 10FEB21:
PROBLEM SOLVED.
Installed a David Tubb 42 coil Chrome Silicon recoil spring in rifle.
Hit the range this morning...rifle functions & runs now like a scalded ape. Did about 25 lock back tests on about 8 different type of mags..100%.
Chambered & fed 100% with 150 rounds. Threw all brass into a ballcap size area at 4:30 using MEN193.
Really tested the rifle as much as I could & am now satisfied that it was a weak, or simply not strong enough RS to run the bigger, heavier NM bcg. Recoil was brisk and snappy, chambering was very solid. So, I am happy now to move on to next step of accuracy testing- which I will report back on here whenever that happens.
To ALL who helped & made suggestions & ideas..except that one asshole in Texas...THANK YOU so much.
SHOUT OUT TO SOTAR-THANK YOU SIR!
Only downside to the todays range trip is I broke the FP on my Gen 4 G19..thats my main carry/SD gun too. Praise God it happened on the range..less than 50 rounds in. Got others to use while new FP's come in.