Re-crowning the barrel | G4 Precision

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Extreme AR Accurizing

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Introduction (6:51)
Conceptual Overview (4:36)
Tools, equipment, supplies (15:02)

Evaluation for Accuracy Problems and Issues

Introduction to the evaluation process (1:16)
Gauging headspace (2:50)
Measuring twist rate (1:47)
Borescoping the barrel (9:59)
Slugging the bore (includes casting slugs) (17:49)
Checking gas tube fit (3:12)
Checking muzzle brake alignment (1:26)
Evaluating bolt lug contact (8:53)
Bolt carrier fit (0:41)
Testing ignition energy (primer penetration test) (3:39)
Measuring receiver fit (5:22)
Evaluating the trigger (7:22)
Evaluating scope, scope rings, and fit (6:35)
Conclusion of the evaluation (0:24)

Accurizing work processes

Trigger work (6:21)
Lapping bolt lugs (13:56)
Refitting gas block and gas tube (4:02)
Slugging and hand-lapping the bore (24:59)
Truing/lapping receiver, bedding barrel into receiver (20:57)
Re-crowning the barrel (27:26)
Refitting the receivers (30:58)
Scope mounting/bedding into rings (27:08)

Conclusion

Conclusion and results (6:00)

Downloadable forms and tool list

Finished AR Evaluation form from this rifle (downloadable pdf)
Blank AR Evaluation form (downloadable pdf)

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Re-crowning the barrel

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