Description
Learn how to field strip, clean, lubricate, and reassemble the Brownells BRN-180 SCNR upper receiver. Caleb walks through routine maintenance of the Side Charge Non-Reciprocating model, using a suppressed 300 Blackout setup to show where powder residue and carbon accumulate.
This walkthrough covers the bolt carrier group, charging handle sled, recoil springs, piston assembly, gas block, barrel, and lower receiver. Caleb also discusses spring inspection and replacement considerations, then finishes with reassembly and an unloaded function check.
Have a BRN-180 maintenance question? Leave it in the comments or contact the Brownells tech line.
Chapters
0:00 Introduction to BRN-180 SCNR maintenance
0:41 Unloading and preparing the workspace
1:32 Separating the upper and lower receivers
2:20 Removing the recoil assembly and bolt carrier
3:36 Removing the charging handle and sled
4:24 Bolt carrier group disassembly
5:39 Preparing to access the gas system
7:35 Handguard removal
9:18 Gas system disassembly
11:52 Cleaning preparation and solvent soak
12:40 Cleaning the bolt and small components
14:16 Extractor removal and cleaning
16:39 Cleaning the sled and bolt carrier
20:07 Recoil guides and spring inspection
21:09 Cleaning the upper receiver
22:50 Barrel cleaning
26:28 Muzzle device and gas block cleaning
28:13 Lower receiver cleaning
30:30 Bolt carrier group lubrication and reassembly
33:17 Cleaning the piston and piston cup
36:14 Checking piston fit and adjustment
38:12 Gas system lubrication and reassembly
40:33 Reinstalling the handguard
41:21 Reinstalling the sled and charging handle
43:32 Bolt carrier lubrication and installation
44:38 Recoil spring care and replacement considerations
47:14 Reinstalling the recoil assembly
48:33 Final assembly and function check
49:23 Closing thoughts