I know nothing about the 'reliability package' but it was easy enough to check this: SA if i recall charges a pretty penny for the mods, hundreds of dollars I believe, on a like 900$ carbine.
SS101 Reliability Package - Colt M4 Carbine $150 All modifications, special parts, gaging and assembly. More Info: M4 Reliability Package. This has been our most popular service for well over 20 years. Exact same price since we developed this package for a Federal Agency in late 1994.
My guesses:
Several Barrel Assy Modifications: 1) ream gas port; 2) blend feed ramps; 3) align FSB
Multiple Gas system Modifications: 1) align gas tube with carrier key; 2) polish 'bulb' end of tube; 3) 1) debur and polish key mouth; 4) ensure torque and staking on carrier key
Two Bolt group Modifications: 1) replace extractor spring and stone extractor; 2) face/polish rear of lugs
Upgraded Buffer Assembly: Convert Carbine buffer to H or H2
Hammer Assembly and various other parts: 1) springs; 2) detents; 3) improve sear engagement
Easily a couple of hours of work for my mods.
Here is what someone said on another forum: Think about it like this. $150 is the equivalent of two hours labor. This is two unhurried hours during which a master armorer for the weapon system goes over it with a fine tooth comb and ensures it is GTG. During this time, he tweaks the gun as needed and also imparts his skills for making it 100% reliable.
The late Pat Rogers: We have seen a number in class, including some from board members. FWIW, i have never seen a SAW modified Colt ever have a problem. In police work, we call this a clue...
IMO if it buys you peace of mind, go forth and be happy.
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