There are an awful lot of factors that will lead to "success". And as many that will lead to failure. First, you need to define what success is in your book. Yes, the locking piece can play a big role. But what are your expectations?
In my experience with the H&K 53: it isn't a good gun to suppress unless you have can that is 15" long and unwieldy. All the modern cans are too small and will not quiet it enough to be considered "Ear safe", 138dB or less.
The ammo is too blasty and the barrels too short.
Subsonic ammo hand cycled with be the best, but not considered safe for the weapon.
Yeah, what STG77 said. I rarely shoot my '53 for all the reasons mentioned. I have used a HUGE B&T can to make it quieter but it still isn't really quiet. For all the inherent '53 reasons, the short SIG552 and M16 Commandos are quieter and more pleasant. I keep kicking myself for not buying a '33K instead.
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