Meanwhile my dumb ass is sitting here goggling at all these terms I don't know.
P-rails, aka pic-rails, aka
Picatinny Rails, are basically an attachment system for rifle accessories. In the bad old days you either had to have scope mounts specifically made for rifles, or in the case of the Colt Commandos Delta Force used to use, they'd literally duct tape flashlights to their rifles.
Setups would look like this. So in the early 90s Pic rails became a thing, and their popularity really started taking off after Afghan War in 2001 and Iraq War in 2003, because now here's an easy system to modify rifles. You can take a stock rifle and quickly add accessories to it - in less than a minute, I can put a red dot, laser, flashlight and grip on my gun (it's a gel blaster, aka Chinese not!Airsoft gun, because Malaysia frowns on private weapon ownership). This allows you to quickly customise rifles for the expected roles.
Crye Precision is a company that's developed a fair amount of kit that's widely used. They developed the Crye airframe helmet (aka the slick high cut helmet all the cool operators are using), the Multicam camo patters (again, very popular with special forces units around the world), the zip up combat shirts with camo sleeves, the cool combat pants with built-in kneepads, the JPC.... basically Crye might not be the super number 1 best company in their field, but they are a trendsetter with good build quality and people gravitate to them because they're the first.
Plate carriers are a style of body armor. PASGT, which is the current body armor in use by the US military, is basically a vest with woven layers of kevlar; if you get shot, the vest takes damage, it's fucked and it needs to be replaced. Plate carriers, as the name imply, are vests with "pockets" on the front and back to accomodate solid armor insert plates. If you're shot while wearing a plate carrier, it's the insert plate that takes the damage. Pull it out of the plate carrier, put a new plate in, you're good to go. After the turn of the millenium pretty much all militaries that could afford them went to plate carriers, because they're lighter, more comfortable, easier to move with, and easier to upgrade: it's just a matter of opening the sealed pocket, pull out the old plate, and replace with the new upgraded plate.
....anyway what Das is basically saying here is that once we get tossed into the new world we should become like Crye and Magpul, two companies that have become very pervalent in terms of spec ops gear: lots of people wear Crye combat shirts, combat pants and Airframe helmets; Magpul is one of the most dominant rifle accessory companies: shitloads of SF dudes run Magpul stocks, foregrips and backup iron sights, and Magpul's Polymer Magazine (or Pmag) and Enhanced Magazine (Emag) are so popular that they have National Serial Numbers, meaning that US military units are allowed to purchase these things with government money.
The US Army recently cancelled a failed program to develop a new improved 30-round magazine to replace the existing USGI M16 style aluminium magazine that's been in use since Vietnam. The program failed and the prototypes actually performed worse than USGI mags. The USMC just made a bulk order for Magpul's Gen 3 Pmag.
On one hand I'm not really keen on this, because as I told
@newwriter we're Delta Force, not BCM. On the other hand so many dudes in the tactical accessories aftermarket (Sup Travis Haley, Larry Vickers
) basically went "hey this is the kitbash thing I'm doing in my unit, I wanna try and make a commercial product out of it." Magpul's
magazine pull was basically an alternative to duct taping mags for better grip.
Haley was kitbashing slings and things when he was in Force Recon. The single point Chalker Sling was invented by Dennis Chalker while he was a plankowner at SEAL Team Six. And so on.