My parts all arrived early and I couldn't resist putting a few mags through my SBR. Here are some initial thoughts.
Lower:
Spikes Tactical on a Form 1
Spikes complete LPK
Magpul MOE SL Grip & SL-K Stock
Macon Armory Buffer (full at 7.5oz using spikes carbine spring)
Stern Defense Adapter Block
Bobbed Hammer w/ JP light spring kit
Upper:
Stern Defense
Raptor LT charging Handle
Primary arms Black Friday MD-ADS
Vortex Spitfire 1x
Strike Industries Ultimate Dust Cover
BCM MLOK VFG
Ammo: Federal AE 115gr
Mags: 3x Glock OEM & 1x ETS each loaded once
Install: Only took a few minutes and went as expected.
Shooting: 100% function for the 130 rounds of ammo tested today
The Awesome:
-100% function
-Fit and Finish was top notch and I really like the Rail
-Puts a damn big smile on my face
The Minor (Upper):
-Dust cover lost the detent somewhere between mags 3 & 4. I messaged Stern about getting a replacement kit sent. More of a PITA than anything.
-They sent 2x of the same size allen wrench. I had the proper size but again just pointing out.
-For me I felt like they put STERN Defense in too many places on the upper. I already swapped out the CH which had their logo (just prefer raptors) and will swap out the dust cover. I feel the rest of the logos are just fine. Just really the CH and dust cover put me over the top.
The Minor (Buffer):
-Buffer had some rust on the face and a pit on the side from what appears to be carbon contamination. Scrubbed it using a brush and oil but still has a pit on the side of the buffer from the rust. Does not impact function in the least bit but for the price I wish they could take a littler better care to avoid this or check before shipping.
Mags: 2 of the 3 glock mags drop free when empty. 1 for whatever reason does not. Also towards capacity its almost like they hang up and have to really force the round using a LULA. Happened on first loading of each mag for around 2 rounds each. May be normal but I have no experience with them and just wanted to point out. My 1x ETS mag I own dropped free and functions for the 1 cycle it had.
Overall Impression: Very happy with my purchase and can't wait to put more rounds down range. Only had a few minor little "Bad points" to try to balance it out. The more important thing to me is fit & finish & function and all three of these are excellent.
Any questions ask away.
ETA 1: Measured mags and found the one that would not drop free needed some sanding around Mag catch area. Drops free now.
ETA 2: Stern messaged me Saturday night and will have a new cover assembly and wrench in the mail on Monday.
ETA 3: Macon just shipped me a new buffer free of charge.