SG 553 BK. The .300 AAC Blackout (designated by the VSV as 300 BLK) and 300 AAC Blackout by the CIP, also known as 7.62 x 35mm, is a carbine cartridge developed by the Advanced Armament Corporation (AAC) in the USA for use in the M4 carbine has been. The purpose is to bring about ballistic properties similar to the 7.62 x 39 mm cartridge.

sig sg 553的加長槍管版本被稱為sig sg 553 lb，它裝有一根能夠發射22毫米 槍榴彈和安裝刺刀的347毫米（13.66吋）的長槍管。使用者亦可以向原廠選擇在sg 553系列步槍的機匣和護木上整合mil-std-1913戰術導軌以及可調節式槍托。 [2]

A long barrel version of the SG 553 known as the SG 553 LB incorporates a 347 mm (13.7 in) barrel with provision to fire rifle grenades and support a bayonet. Further factory options for the SG 553 rifle series are an integrated receiver Picatinny rail and an adjustable butt stock. [ 10 ]

The SG 553 also known as Stgw 04 and used in the Swiss Forces. Its specially made for special units, paratroops and the AAD 10 (CH).

在外观上，SG553和SG552差不多，不过有一个外观细节可以把两者区分开来，SG552的拉机是细长圆柱形的，而SG553则采用与SG551相同的扁弯型拉机柄。 由于SG552在实际使用中发现很容易产生裂纹，而复进簧的寿命比原来的型号要短得多。 因此在2009年SIG公司又推出了新的SG553步枪。 SG553最大的变化是把复进簧重新移装到枪管上方，仍然是绕在活塞杆上。 据说SG553的可靠性和使用寿命都比SG552要好。

2021年5月27日 · SIG Sauer SG 553 BK - a full-auto SIG 550 series rifle chambered in .300 Blackout. Photo Credit: SIG Sauer AG. So, you can imagine my surprise when I saw this recent video of his.

Platform is renewed: our platform is again extended with the SG 553 BK in caliber .300 AAC Blackout (7.62 x 35) and comes with our own SAN suppressor. Especially for the SG 553 BK developed suppressor allowsto shoot subsonic and supersonic Ammunition. Our innovation for tomorrow is based on our immense experience in the past. PRODUKTKATALOG.

2022年3月8日 · The second firearm is a SG 553 BK in .300 Blackout with a matching suppressor. Which one do you like best? You can find more information about the SG 751 SAPR here. The SG751 SAPR precision rifle with cal. 7.62 x 51 mm NATO guarantees superior performance even under the toughest conditions.

2017年7月6日 · SIG SG 553突击步枪是迄今唯一能够与AK枪族媲美的枪支，该枪不但在性能上丝毫不输于AK之外，还适合在任何环境作战，是一把用途非常广的枪支。 SIG55X作为一整个系列，不知诸位枪友更喜欢哪一款呢？ 朋友，世界就那样，但你可以不同。 关注微信公众号“泡司令”，发现让你爱不释手的饰品、腕表和EDC装备！

2016年5月20日 · The SG 553 is also known as Stgw 04 and used in the Swiss Forces. It’s specially made for special units, paratroopers and the AAD 10 (The Army Reconnaissance Detachment.) At IWA they presented the 300 Blackout version, with …