Brownells Adds the New BRN-180SH Upper Chambered in 300 BLK

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From Brownells . . .

Brownells unveiled the BRN-180SH complete upper – the newest addition to the popular BRN-180 line – announcing it at the IWA Outdoor Classics show in Nuremberg, Germany.

Chambered in 300 Blackout, the BRN-180SH has 10.5” barrel with 5/8-24 muzzle threads, and a gas system with three settings – unsuppressed, suppressed, and off.

The BRN-180SH retails for $999.

With the gas system turned completely off, the upper is converted into “single shot” mode, virtually eliminating sound produced by gases escaping through the ejection port or by the bolt carrier group cycling.

When fired with a suppressor attached and the gas system turned off, the BRN-180SH in single-shot is even more quiet than a BRN-180S.

The BRN-180SH comes with an adjustable charging handle that can be turned downward to help transform the upper into a straight-pull action, allowing for fast follow-up shots when set for the quietest possible operation.

The upper can be quickly converted back to unsuppressed shooting with a simple twist of the gas adjustment and by turning the charging handle back to its upward position.

Like the rest of the BRN-180 line of uppers, the BRN-180SH fits onto any standard AR-15 or BRN-180 lower, and requires no buffer tube assembly. It readily operates with a folding stock, or no stock at all.

To see the new BRN-180SH, and the rest of the BRN-180 line of uppers, lowers and parts, visit

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  1. Already have one of their BRN-180 uppers on an AR lower, works perfectly. Not attracted to this one though, not interested in 10.5 inch barrels in 300 blk.

  2. Does using something like a ‘Kali-Key’ on an otherwise standard upper give a similar result?

    • For the “single-shot” (really bolt-action) mode it should be similar, although I assume the Kali-Key would allow more gas to vent into the upper.

    • Yes, similar. I have an AR equipped with a KaliKey + BCG to make it a single shot format. I keep the original BCG + charging handle in its case so I can swap them back in within 60 seconds after crossing over into one of my neighboring Free America areas outside the CA border.

  3. As interesting as I’ve always found these variants, I could never invest in one. The need to use a charging handle on the side creates a unique issue especially in the argument of ambidextrous use – and anyone that has taken a combat oriented rifle course knows the value of an ambidextrous AR. I guess where there is a will there is a way though.

  4. The new charging handle seems pretty dumb… and losing the dust cover made sense on the ‘sport’ upper. This one, not so much.

  5. You know what would be really cool? If replacement springs and firing pins became available again. For all generations of these uppers.

  6. I enjoy the BRN180. Only problem I’ve had is that the handguard is a limiting factor for muzzle devices and forget about a pin and weld option for your suppressor.

  7. One of the main advantages of the AR-15 rifle is its modularity. The gun can be easily customized and adapted to suit the user’s needs, making it an ideal choice for those who want a rifle that can be easily customized to their specific needs and preferences.

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