![]() I basically took an assembled AR pistol and took it apart, that way I could use the lightweight parts on the Blackbird. I wanted to try and make this build pretty light, since the Blackbird is so light to begin with. ![]() They also only recommend 30 ft lbs of torque on the barrel nut as to not cause any unseen damage to the receiver.Ī little bit about the build with the X-7 Blackbird receiver set, is in order. This prevents the upper receiver from being over torqued and damaged. When installing a barrel and handguard onto the Blackbird, Kaiser recommends the use of a “reaction rod”. I have zero problems with this, it's just different enough to mention. Instead of being able to put the rear takedown pin spring in normal, it now goes under the pistol grip, similar to the safety detent. The last two differences have to do with assembling the lower and upper. My guess is to save weight, since the forward assist isn’t always needed. The Blackbird upper receiver also does not have a forward assist. I went with the old A2 style grip, because it is one of the lighter weight grips around. Because the Blackbird is about weight, Kaiser also includes a skeletonized titanium grip screw for mounting your favorite grip. I installed a Timber Creek ambi safety and it works well. Most standard and ambi safeties will work with the Blackbird. ![]() As with the trigger pins, the lightweight port door assembly is also included. The X-7 Blackbird also uses a proprietary port door on the upper receiver. It pretty much accepts any mil-spec or drop in AR trigger. These V2 pins work for any trigger you wish to install into the Blackbird lower. Kaiser gives you their proprietary V2 anti-walk trigger pins, as well as the allen wrenches to install them. Standard trigger pins will work, but there is no reason to use them. First, since the lower receiver is slightly wider than a standard aluminum one, at least in some spots, it can’t use standard anti-walk pins to hold the trigger in place. With the X-7 Blackbird being engineered differently, it has a few slight differences. For comparison, a standard stripped, forged AR15 lower receiver, without an upper, weighs 8.8 ounces. So what does this Ti-Graphite composite get you? It yields a super strong upper/lower receiver set that weighs in at 9 ounces stripped. I still put some oil on the BCG, but it cycled smoothly without it. Essentially, it is so smooth that very little to no lubrication is needed. Another huge advantage to the Ti-Graphite composite is its lubricity and wear resistance. The Blackbird’s Ti-Graphite composite also adds in some more strength, simply because the titanium and graphite are molded into the composite. For instance, some of these places are the threads for the buffer tube and the barrel nut threads. So they put titanium and anodized aluminum inserts into the places needing strength. ![]() They wanted it to be stronger than the standard aluminum AR15 receivers. It has more material in certain places to help with strength. This is because Kaiser engineered the composite receiver, so it is not just your everyday “polymer” like the others. Even though some of these are true, they do not apply to the Kaiser X-7 Blackbird, or any of Kaiser’s other receivers. There are a lot of misnomers about composite, or plastic, receivers. Let’s talk a little about this Ti-Graphite composite. ![]()
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