The rifle's four major groups are packaged as shown in Figure 2-1.
1. Upper Receiver
3. Lower Receiver
Ensure all components are present (see paragraph 1-7, page 1-4) and inspect for obvious damage, reporting any discrepancies to the Barrett factory. Detailed inspection should be conducted as follows:
Figure 2-1. Four Main Groups
220.127.116.11 INSPECTION - THE UPPER RECEIVER
(1) Barrel springs (1), must not be overstretched, and each coil should be tight, with no spaces between coils.
(2) Impact bumpers (2) should be in good condition (not frayed, cracked, or twisted).
(3) The muzzle brake (3) should be tight and fully screwed on (see 3.3.4, page 28 for installation procedures).
(4) The upper receiver (4) should not be cracked, bent, or burred. Pay special attention to the hinge lip at the front of the receiver to ensure that it is not cracked, bent, or deformed in any way.
(5) The barrel (5) should be clean and free of obstruction.
(6) All scope mountings (6) should be tight, in good condition, and free of oil (iron sights, front (7) and rear (8), may be lightly oiled at pivot points to prevent corrosion).
18.104.22.168 INSPECTION - THE BOLT CARRIER GROUP
(1) Ejector and extractor (1) must be checked to ensure they are under spring tension, and neither chipped nor worn.
(2) With firing mechanism decocked (use rear lock pin to depress sear (2), depress the bolt latch and manually work the bolt in and out, feeling for any roughness, which may indicate wear, corrosion, or dirt/grit in the carrier (4).
(4) Inspect bolt latch (3): should not show any deformation.
22.214.171.124 INSPECTION - LOWER RECEIVER
(1) With bolt carrier in place, pull it rearward and check to see that the mainspring (1) moves freely (full travel) and is not deformed.
(2) Hold bolt carrier back and down approximately % in (6 mm) under mainspring housing (2) (sheet metal closure). With the thumb safety (3) on fire, pull the trigger. Firing mechanism should function (a slight rise in bolt carrier is normal). If the housing is bent, the bolt carrier will rise excessively as the trigger is pulled, preventing proper functioning.
(3) Lower receiver (4) should not be cracked, bent, or burred.
(4) Check bipod assembly (5) and mounting hardware to see that legs extend and hardware functions properly.
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