t-star,
imVho, the FIRST Beretta BM-59 was THE BEST of the lot. - straight semi-auto. = truth be told, i see NO real good reason for full-auto BM-59 in REAL combat, as it gets too HOT & "quits" soon (as does the M-14) to be anything like a squad automatic weapon.
(that's why there are things called: LMGs.)
fwiw, IF the M-14 had not been conceived/bought, there would be NO need for the BM-59magazines to "migrate".
as for me, i won't likely buy anything more than the superbly accurate Danish Garand that i have for a SHTF weapon, as i TRUST mine. = my "mills belt" holds enough ammo in 8-round clips to be in a goodly skirmish, much less anything that i'll ever face again in this go-round (i'm 65YY.).
NOTE: if push came to shove, my 2 brothers-of-the-heart (& the 3 ladies, who are all shooters!= one of the ladies is a DEAD SHOT with her .243WIN semi-auto, out to 250M or more & ALWAYS gets her deer.) & i could hold off a good-sized force,from our mountain-top lair (if i'm there), as about 3/5 of "the perimeter" is straight DOWN over 200M.= truthfully, we have enough weapons & ammo on the mountain to START a good-sized holding action. = the local sheriff & his bunch are "good friends" & that helps, too.
(the last time i looked, we had over 10K of M2 ball, alone, in the vault & enough food/water for >12 months.= LOTS of snow/ice in the wintertime, so we are SET, if we are SNOWED IN.)
AND
we are FAR from alone, as there are LOTS of well-armed neighbors, too.
(ya'll oughta see "shooting day" in our neighborhood, as it LOOKS like the NG is out.= LOTS & LOTS of ex-CMP garands up there.= fyi, one neighbor has, at last count, about 25 as he is gathering up every variation & maker's product.).
SHOULD that BAD DAY come & i'm here in south TX, we aren't defenseless here, either, as we can flee onto the post, which is just 150M away = as a retired GI (MP) & his DW, they won't turn us two away.
yours, satx