What a coincidence. My JSE M4 upper came in Monday. Took it out yesterday and should have gone out again today but came down with lazyitis.
Here's what I found:
M4 flat top upper - Splintered A forge marking - with a 16" M4 profile barrel (DTI 1/9) - light profile under the handguards and the M4 feedramps.
A2 flash suppressor but the crush washer was installed backwards. The large side goes against the f/s not the barrel. After ~150 rounds it's still tight.
The standard triangle shaped front sight base/gas block is installed with taper pins. The sling swivel is installed with a rivet. But the rivet could have been tighter. You can actually move the rivet back and forth - or rather left and right.
The round handguard cap is blued and not parked. It's also loose on the barrel. You can move it fore to aft. Someone didn't make sure the front sight base was moved as far back as it should have been when they drilled for the pins. But when the handuards are on they are rock solid so in the end it doesn't matter all that much.
Oh, the upper sports the "T" markings too.
The bolt carrier is a full circle carrier that is cut back like the old Colt SP1 carriers. That is the bottom of the ring is ~¼" thick or so. The firing pin is shrouded.
Another oh yeah, the front sight post was screwed in just far enough to catch the detent. I ran it down so the flange was flush, or a click or two above, the base.
First day out if I could see it I could hit it!
A few minor issues but overall I'm very happy with the $375 I spent.
Yet another oh yeah. This is mounted to a Stag lower I bought a few years ago and I've got to really lube the hell out of the take down pins and hammer them into place with the heel of my hand. I use a live round to hammer the pins back out. With my hand again.
This is the tightest mating pair of receivers I've run into. They have loosened slight in the 150 rounds so I imagine they'll loosen up a bit more with more shooting.
After 10 yrs hanging around this place I finally have an M4gery. All the hot rage back in the day.
BTW, the bottom half of a MagPul MOE handguard really scuffs up the finish when you install it backwards.
I'm please with the upper I got and wouldn't hesitate to order from them again.