Good question.

As an example... BCG comparisons.

These are the posted specs of the SAINT

BOLT CARRIER GROUP
M16 BCG w/ Carpenter 158 Steel Bolt, Shot Peened & Magnetic Particle Inspected
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These are the specs of a $99 BCG on sale at Palmetto today....

Made in USA. Bolt is made of Mil-spec Carpenter 158 steel, Shot peened, High pressure tested and Mag Particle Inspected. Gas key is machined out of bar stock, chrome lined phosphate coated, and secured with grade 8 fasteners and staked per mil-spec. Bolt carrier is phosphated outside and chrome lined inside.

Features:
Milspec Carpenter No. 158® steel bolt
Shot Peened Bolt
High pressure tested (HPT)
Mag particle inspected (MPI)
Chrome Lined Carrier (AUTO)
Chrome Lined Gas Key
Gas Key Hardened to USGI Specifications
Gas Key Grade 8 Hardened Fasteners
Gas Key Staked Per Mil-Spec
Tool Steel Extractor
Extractor Spring
Extractor O-ring Insert

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As far as the barrel... a mid length 41V50 Chrome Moly Vanadium Steel barrel can be purchased from PA for $119 or $99 on sale.

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SAINT the rifle.... yawn. SAINT the video way more impressive.