Tuning the direct impingement gun for the perfect ejection pattern typically falls to the buffer and its weight to resist backwards motion.
You could buy a heavier buffer or if you are mechanically inclined, you can change the weights inside the carbine buffer itself to create your own H, H2 or H3 buffers at less cost then buying a new buffer outright.
Although this is simply a tungsten cylinder, I will add the same caveat I add to gun parts: do not buy this if you do not know what you are doing.
For people buying Lockhart raven builder kits, you will almost certainly need to play with the buffer weight to adjust for various gas and barrel lengths.
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