Big Iron (and others):
I don't claim to have invented the wheel, with my preference for a .357 lever gun, but I have had mine since '81, and never found anything better, to include the Marlin and Ruger semis of all persuasion, including the Mini-14.
Yes, you can load (and fire) a magazine-fed semi more quickly than the tube-fed lever gun. This seems to me academic for a couple of reasons. We are talking about a defensive carbine, here, and the lever gun's 10 to 12 round capacity full-up would seem to be sufficient for most squad bayonet charges. I DO have a 10-round butt cuff on my Marlin, and appreciate the easy of topping up the magazine with single rounds while the gun is in battery. With respect to the 'quickness of fire' issue, I humbly suggest that careful aimed fire is not encouraged by the magazine-fed semi, whereas 'spray and pray' IS.
I have applied a peep rear and old-style Redfield Sourdough front sight to my Marlin. The sight picture is clean, and accuracy is in the three MOA range. A 'scope doesn't seem indicated on an arm like this, if only for the weight it adds.
I prefer the Marlin to the Winchester, Browning and Rossi lever guns. My first centerfire rifle was a Marlin, and I've not seen any reason to switch.
I have shot jacketed bullets almost exclusively in the Marlin. The Microgroove barrels of this marque are fussy about lead bullet loads, there's a special set of requirements to load for accuracy and it's a pain to clean the lead out after a session with them.
.38 specials...I've only fired a few: 125 gr. factory Plus-P's. They shoot well and accurately, but high of the 158-grain zero in my gun, so while they are usable, regular use would require a sight change. My standard practice and plinking load is made up with 2400 powder and Hornady 158 gr. jacketed FP or HP bullets in .357 cases. I have a small hoard of the original Black Talon 180-grain factory loads which are very accurate and murderously effective on medium game. They are the rounds in the magazine, while the little blaster leans behind the bedroom door.
--slabsides
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If they take our guns, I intend to let my hair grow long and acquire the jawbone of an ass.