Great, but....... - Tiger Rock SB15 Pistol Buffer Tube

So, I bought this tube for a 10mm direct blowback pistol build. It was 9 inches so I could test added weights, and it's the only pistol tube I've found that had a 1.17 OD. Nice. Got it in the mail, quality feels top notch. Measures at exactly 9 inches length and 1.17 on the dot. The ID is one of the smoothest and cleanest I've felt, no honing required. However, what they don't tell you is that the inside length is only 7 inches long. My 10 oz. Buffer is just barley short enough to fit, but it leaves me no room to try adding extra weights if needed. Great tube for being compliant with standard buffer systems, but if you're running a direct blowback system and you need more space for weights, it's something to be aware of.